问题: what is it?
it is usually made of metal.it is round on one end.It can be very small,small enough to fit in your pocket,or large,but not as large as a car.it is used to make noise.it can be used to give a signal.Sometimes it's part of an orchestra.Sometimes it is electric and you push a button to make it ring.
解答:
cell phone /mobile phone?whistle?
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