CNN News：新型流感病毒

H1N1 and H3N2 are examples of what?

H1N1和H3N2是什么?

Asteroids, flu strains, chicken breeds or robots?

小行星，流感毒株，鸡类还是机器人?

With an H4 hemagglutinin and an N4 neuraminidase, these are examples of strains of the flu.

H4血凝素和N4神经氨酸酶，这些都是流感病毒株。

AZUZ: And a flu strain circulating in the U.S. this year, like the one that hit Australia last year, is a nasty one. Widespread flu activities are being reported in every part of the continental U.S. at the same time. This is the first year that`s happened in the 13 years that the Centers of Disease Control has been monitoring the flu.

今年在美国流行的流感病毒，就像去年袭击澳大利亚的流感病毒一样，是一种令人讨厌的病毒。美国大陆的每个地区都在同时报道广泛的流感活动。这是在疾病控制中心监测流感的13年中发生的第一年。

One reason: these year`s vaccine doesn`t appear to be very effective against the actual flu virus that`s spreading.

原因之一是:今年的疫苗对传播的流感病毒似乎没有什么效果。

Experts predict it will be about 30 percent effective. In recent years, the vaccine has been 40 and 50 percent effective, though there was an exception in the 2014 to 2015 season when the vaccine was only 19 percent effective, according to the CDC. And "The New York Times" reports that this season is looking a lot like that one.

专家预测，这一比例将达到30%左右。美国疾病控制与预防中心(CDC)的数据显示，近年来，该疫苗的有效性已经达到了40%和50%，不过在2014年至2015年期间，该疫苗的有效性只有19%。《纽约时报》报道说，这个赛季看起来很像那个赛季。

The hopeful news is that experts think the flu season maybe hitting its worst point and that it`s starting to level off. But it takes weeks for flu activity t actually slow down.

好消息是，专家们认为流感季节可能达到了最坏的阶段，并且已经开始趋于平稳。但是，流感活动实际上需要几周的时间才会减缓。