The utmost caution must be exercised when handling explosives.

处理爆炸品一定要慎之又慎。

《牛津词典》

He knows honesty is a skill that must be exercised always.

他们懂得诚实处世是一种技巧，必须反复练习才能熟练掌握。

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Care must be exercised in attaching the lead wires to the soldering tabs.

在往焊接接线片上焊导线时必须非常小心。

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Nevertheless, caution must be exercised to ensure that funds are not invested with a disqualified person.

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But he also said that freedom of expression must be exercised in a spirit of mutual respect and mutual understanding.

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But that right must be exercised subject to conditions laid down by authorities charged with the duty of keeping law and order and public peace.

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