All existing supplies of helium ought to be conserved and released only by permit, with medical uses receiving precedence over other commercial or recreational demands.

现有的所有氦供给应该被保存下来，并且只有在获得许可的情况下才能释放，医疗用途优先于其他商业或娱乐需求。

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Firstly, all existing supplies of helium ought to be conserved and released only by permit, with medical uses receiving precedence over other commercial or recreational demands.

首先，所有现有的氦供应应该被保存下来，并且只有在获得许可的情况下才能释放，医疗用途应优先于其他商业或娱乐需求。

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She had to learn that her wishes did not take precedence over other people's needs.

她必须懂得，自己的愿望不能先于别人的需要。

《牛津词典》

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