Let's start working at once.; Act without delay.

说干就干。

《新英汉大辞典》

It's usually best to wait, but in the present case I'd advise you to act without delay.

通常情况下最好是等待，但眼下的情况我倒是建议你立即采取行动。

youdao

Of all the disasters to strike us, the oil spill in the Gulf of Mexico could, however, be potentially be the most terrible, and we must act decisively, act without delay, and act in unity to stop it.

在所有袭击我们的灾难中，但在墨西哥湾的石油泄漏可能是有潜质地是最可怕的，和我们必须采取果断行动，没有延迟的行动，和团结行动加以制止。

youdao

He urged the "rational" traditional leadership of the Brotherhood to act without delay to curb this tendency.

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Importantly, if the employee is underperforming, document performance, follow appropriate standards within the organization and act without delay.

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But I also want to urge all members of Congress to act without delay in the coming week to resolve their differences and pass this plan.

WHITEHOUSE: Presidential Press Conference