例句：
The engine is very noisy at high speed.
这个发动机转速高时噪音非常大。
Our next-door neighbours are very noisy.
我们隔壁的邻居非常吵。
This area can be very noisy at night-time.
这个地方夜间有时会非常吵。
When I approached, they grew silent.
当我走近时，他们变得沉默了。
She was silent, smiling mysteriously.
她沉默不语，神秘地笑着。
Her voice quavered and she fell silent.
她的声音颤抖着，继而沉默了下来。