I've told him that he's heading for trouble, but he doesn't listen - it's just water off a duck's back.
我已经告诉过他他会有麻烦的，可是他不听——说了也白说，根本毫无作用。
hold water 站得住脚；属实
Her alibi just didn't hold water.
她的不在场证据根本站不住脚。
water under the bridge 已成往事；不可改变的既成事实
We did have our disagreements but that's water under the bridge now.
我们确实曾经不和，但那已是陈年往事了。
be in deep water 陷入困境；惹上大麻烦
The Democrats are in deep water over their plans for tax increases.
民主党因其加税计划遇到了大麻烦。
make sb's mouth water 使（某人）馋得流口水；使（某人）垂涎欲滴
The smell of that bacon cooking is making my mouth water.
熏肉的香味令我垂涎欲滴。
be dead in the water 沉沦、一蹶不振
So how does a government revive an economy that is dead in the water?
那么政府怎样才能使一蹶不振的经济起死回生呢？
keep your head above water （尤指财务上）勉强应付过去；惨淡经营
The business is in trouble, but we are just about keeping our heads above water.
公司遇到了一些问题，但我们还得勉强应付下去。
take to sth like a duck to water 自然而然地做起…来，天生就会做…
He took to fatherhood like a duck to water.
他天生就是个好父亲。
blow sth/sb out of the water（以压倒性优势）战胜…；击垮…
They came to court with fresh evidence that would, they said, blow the prosecution'scase completely out of the water.
他们出庭时带来新的证据，他们说这些可以彻底推翻原告的指控。
还有这几个，估计根据表面意思，你也能猜个八九不离十，试试吧。
go through fire and water 赴汤蹈火
dip a/your toe in (the water) 小心尝试，探索
be like a fish out of water 如鱼离水，在陌生环境不得其所
blood is thicker than water 血浓于水；家人总比外人亲
You can lead a horse to water, but you can't make him drink.
牵马到河边容易，逼马饮水难。（指为他人做某事创造条件易，使其做某事难。）
water一词的短语，一起看过来：
tap water 自来水
grey water 使用过的水
water taxi 出租船
water table 地下水位
mineral water 矿泉水
running water 自来水
ground water 地下水
bottled water 瓶装水
water content 含水量
Water Margin 《水浒》
waste water 污水
water supply 供水系统
