Finding more efficient ways to travel, and to do so only when absolutely necessary.

寻找更有效的差旅方式，并且在绝对必要时才进行差旅。

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For this reason, it's recommended to use dynamic scopes only when absolutely necessary.

正因为这个原因，只在绝对必要时才推荐使用动态作用域。

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Rolledbales of hay should be used only when absolutely necessary, and only if theouter layers are removed and discarded.

确实需要时可以使用成捆的干草，但外层要剥掉废弃

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If we send our men and women in uniform into harm's way, then it must be only when it is absolutely necessary.

WHITEHOUSE: President Obama Bestows Presidential Unit Citation on the Blackhorse Regiment | The White House

In return, they agree to whine only when it's absolutely necessary -- or every five seconds, whichever comes first.

CNN: Five museums you AND your kids will enjoy

Guidance from the council says an emergency closure should only be made when it is "absolutely necessary in the best interests of pupils".

BBC: School closures