leak是动词泄露， leakage是它的名词

例句

1、

The key question of what caused the leak remains unanswered.

泄漏究竟是怎么造成的，这一关键问题仍未得到答案。

2、

The leak was eventually traced to a broken seal.

最后查出泄漏是由于密封处破裂所致。

3、

The tank had leaked a small amount of water.

水箱渗漏出少量的水。