敲门声的英文：
tap-tap

参考例句：

A rap on the door
轻轻的敲门声

A sudden knock at the door jumped out of my skin
突然的敲门声使我吓了一跳。

There is a light rap at the door.
有轻轻的敲门声。

He opened the door in response to a knock.
他应敲门声而开了门。

I heard a knock at the door.
我听到了敲门声。

A knock on the door aroused us.
敲门声把我们唤醒了。

I could have sworn(ie I was certain)I heard a knock at the door.
我千真万确听到了敲门声.

He was roused from sleep by a heavy pounding on the door
一阵敲门声把他从睡梦中惊醒了。

A sudden knock at the door drew us up sharply in our conversation.
一阵突然的敲门声使我们停止了谈话。

Her letter was scarcely finished when a rap foretold a visitor.
她的信刚刚写完，就听到了敲门声。

tap是什么意思：
n. 轻打；水龙头，塞子；电话窃听
v. 轻敲，打节拍，发掘；跳踢踏舞；汲取

A flick or tap.
轻弹或轻拍

Water is running from the tap.
水从龙头中流出。

There was a soft tapping on my door.
有人在轻轻地敲我的房门。

It is illegal to tap a telephone wire.
窃听电话是非法的。

The tap on the cask was dirty.
桶上的塞子很脏。