Sometimes convenience or practical necessity or just the fancy of an influential person can establish a fashion.

有时，某种便利或实际的需要，或仅仅是一个有影响力的人物的幻想就可以引领一种时尚。

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The meaning of "required" here is that of practical necessity.

这里“需要”的意义，就是实际上的需要。

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The recount is a practical necessity but has no basis in electoral law.

重新计票有实际的必要性，却无选举法作为法律基础。

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The return of flight capital is a practical necessity for the country to keep growing.

ECONOMIST: Screeching to the precipice | The