A fresh egg will sink and an old egg will float.

新鲜鸡蛋会下沉，旧鸡蛋会浮起来。

《柯林斯英汉双解大词典》

Most float on water only a short time before they tire, sink, and drown.

大多数浮在水面上的时间很短，之后它们就会疲劳、下沉、淹死。

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Some pieces sink without trace while others float, like broken meringues, on the water's surface.

有些冰块沉没在海中没了踪影，有些则漂浮在海面上，像残破的冰糕。

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He was one of the first to say, in the 1930s, that economies could just get stuck: they might sink, and then NOT float magically back up.

BBC: Masters of money: John Maynard Keynes

Britain barely joined before being forced to let its currency float (ie, sink).

ECONOMIST: EURO BRIEF

If the rates were allowed to float up to market levels, Irish households, banks, and the government itself, would all sink.

FORBES: Sovereign Debt Levels Imperil Entire Financial System