timely;in time;promptly;without delay;betimes ;

A nasty incident was prevented by the timely arrival of the police.
警察的及时到来阻止了一次严重事故。
来源:《牛津高阶英汉双解词典》The submarine had had time to submerge before the warship could approach.
潜水艇没等军舰靠近就及时潜入水下了。
来源:《牛津高阶英汉双解词典》The police were able to take preventive action and avoid a possible riot.
警方及时采取防范措施,避免了可能发生的骚乱。
来源:《牛津高阶英汉双解词典》
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