一起听英语 51 海豹探测器
Callum: Hello and welcome to 6 Minute English, I'm Callum Robertson and with me today
is Kate, hello Kate.
Kate: Hello Callum.
Callum: Today we're going 'down under' - Kate, where's that, where's 'down under'?
Kate: 'Down under' means Australia.
Callum: And have you ever been there?
Kate: I have. My brother lives there and I've been to visit him twice.
Callum: Ah well, I hope that gives you a good chance of getting today's question right.
Today's question is about Australia and a part of Australia called the Great Barrier
Reef. Off which part of Australia is the reef? Is it …
a: North-east coast?
b: South coast?
c: North-west coast?
Kate: Well I've been to the Great Barrier Reef so I should know this, but let me get this
right. It's on the north-east coast, a:
Callum: We'll find out if you're right later on.
The Great Barrier Reef is perhaps one of the natural wonders of the world but it is
in danger from various environmental factors. Scientists are using elephant seals in
6 Minute English © bbclearningenglish.com 2010
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the Southern Ocean to help them understand what might be going to happen to the
reef. Now the Southern Ocean is the ocean south of Australia which includes the
Antarctic. So why are they using seals? Here's Phil Mercer, the BBC's reporter in
Australia.
Phil Mercer
The elephant seals of the Southern Ocean have been recruited by Australian scientists because of
their diving skills.
Callum: Kate, why are they using seals?
Kate: Well he said they were being used because of their diving skills.
Callum: And I can confirm they are excellent divers. I'm a keen scuba diver myself and a
few years ago I was lucky enough to go diving with seals, not in Australia, but in
the UK, and it was fantastic. They are very inquisitive animals. They follow you
around underwater and play with you and they are indeed fantastic divers.
We're going to hear more about what the seals are doing but first we need to cover
some useful vocabulary. In the next part of the report we hear about 'sensors'. Kate,
what's a 'sensor'?
Kate: Well a 'sensor' is a small electronic device that is used for taking measurements.
Callum: And another word we're going to hear is 'salinity'. 'Salinity'. What's that?
Kate: 'Salinity' is a noun for the level of salt in a liquid. The salinity of the sea is very
important, particularly to coral. If the salinity changes – which means if the level
of salt changes – it can damage or even destroy coral reefs.
Callum: Right, let's get back to the seals. Here's Phil Mercer with more about how they are
being used. How do the seals get information and how does that information get to
the scientists?
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Phil Mercer
They spend much of the winter foraging for fish and squid under the sea ice. Small sensors glued
to the animals' heads, that measure salinity and temperature, are providing a rare glimpse into the
world beneath the waves. When the seals return to the surface the information is transmitted back
to Tasmania by satellite.
Callum: How do the seals get the information that scientists need?
Kate: Well as part of their normal behaviour they dive down under the ice, looking for
food. They have sensors stuck on their heads and these collect the information
about the salinity and temperature of the water. This information is then sent back
to the scientists in Tasmania by satellite when the seals surface, which means
when they come back from being underwater.
Callum: He says the seals are giving them 'a rare glimpse into the world beneath the waves'
– what does he mean by 'a rare glimpse'?
Kate: Well something that is rare, is unusual, it's not common and a glimpse is a word
for a quick look at something. So 'a rare glimpse into the world beneath the waves'
is a way to describe the special view the scientists are getting of what is happening
under the water.
Callum: Let's listen again.
Phil Mercer
They spend much of the winter foraging for fish and squid under the sea ice. Small sensors glued
to the animals' heads, that measure salinity and temperature, are providing a rare glimpse into the
world beneath the waves. When the seals return to the surface the information is transmitted back
to Tasmania by satellite.
Callum: So how is this information being gathered under the ice of Antarctica and sent to
Tasmania of use in predicting what is going to happen to the Great Barrier Reef?
Here's Phil Mercer again.
6 Minute English © bbclearningenglish.com 2010
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Phil Mercer
Government researchers in the state capital Hobart believe that changes off Antarctica are a
precursor to future events in the Great Barrier Reef.
Callum: Kate?
Kate: Scientists believe that what happens in Antarctica is a 'precursor to future events in
the Great Barrier Reef.' 'A precursor to' – this phrase means that they believe that
there is a connection between what is happening now in Antarctica and what will
happen in the future in the Great Barrier Reef.
Callum: Let's listen again.
Phil Mercer
Government researchers in the state capital Hobart believe that changes off Antarctica are a
precursor to future events in the Great Barrier Reef.
Callum: Phil Mercer there. Now just time to give the answer to this week's question which
was about the location of the Great Barrier Reef. Off which part of Australia is the
reef? Kate, you said …?
Kate: I said a: the north-east coast
Callum: And that's exactly the right answer, well done. Well that's all for today but do join
us again next time for more 6 Minute English. Goodbye.
Kate: Goodbye.
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