A: Welcome to our factory. My name is Jiang Hai and I'll show you around here.First we'll take a look at the workshop which produces food thermometers. Please, this way.
B: Has all the work done by men been replaced by automatic computers?
A: Yes, it has.
B: Excuse me what is this?
A: This is a circuit board.
B: Are the batteries in it made by your people?
A: No, they are from other factories.
B: What kind of battery is it?
A :It is lithium which can be used for over three years.