water under the bridge

n. 无法改变的事

例句与用法：

If you lag your hot water tank, you'll save money on your fuel bill.

如果你给热水箱装上外套，你就可以少付燃料费帐了。

Is there any water left in the water tank?

水箱里还有水剩下吗？

water under the bridge

water under the bridge

名词 water under the bridge:

past events to be put aside

同义词：bygone

water under the bridge