He told his son that one feels pain only when the fruits of labor are wasted.

他告诉儿子，只有当劳动的果实被浪费时，才会感到痛苦。

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Adults may think they are protecting children from secondhand smoke when they smoke outside their home or only when the children are not there.

VOA: special.2009.01.07

It's one of the only compounds, there's only I think three, where the density actually goes down when it freezes.

它是我见过的，唯一一个，在降温时密度下降的化合物。

麻省理工公开课 - 固态化学导论课程节选

Yeah, run the ball is called, when you run the ball, generally you only do it from 10 yards.

是的，就叫“带球跑”，带球跑的时候，你通常只从十码的地方开始。

美式足球 - SpeakingMax英语口语达人

Only when the shareholder actually sells his own shares is there a taxable event.

FORBES: Capital Idea

The history of Irish republicanism shows that only when the conditions are right can dissident groups take over.

BBC: The IRA's history of splits

Only when the option is exercised does a transaction with tax and bottom-line implications take place.

FORBES: Fact and Comment