防冻水栓的英文：
unfreezable tap

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。