例句：
The engine is very noisy at high speed.
這個發(fā)動機(jī)轉(zhuǎn)速高時(shí)噪音非常大。
Our next-door neighbours are very noisy.
我們隔壁的鄰居非常吵。
This area can be very noisy at night-time.
這個地方夜間有時(shí)會非常吵。
When I approached, they grew silent.
當(dāng)我走近時(shí)，他們變得沉默了。
She was silent, smiling mysteriously.
她沉默不語，神秘地笑著。
Her voice quavered and she fell silent.
她的聲音顫抖著，繼而沉默了下來。