You don't need to reply at once.

你不需要立即回复。

youdao

Please reply at your earliest convenience.

请尽早答复。

《新英汉大辞典》

We demand of him to reply at once.

我们要他马上答复。

youdao

And I'm also like everybody else on emails; and I'll get your emails, panic emails at 3:10 in the morning and I'll reply at 4:45. So, it goes like that.

电子邮件我和其他人一样,我会收你们的邮件,早晨3:10紧急邮件,我会在4:45回复,所以就是这样

耶鲁公开课 - 1871年后的法国课程节选

When we finished last time, we were looking at John Stuart Mill's attempt to reply to the critics of Bentham's Utilitarianism.

上节课结束时，我们讲到约翰·斯图尔特·穆勒试图回应,对边沁功利主义的批判。

耶鲁公开课 - 公正课程节选

We look at what emails you reply to if you reply in theory that suggests this user must care about whoever sent this email or the topic they are in.

我们看看哪些邮件要回复,如果你回复了,理论上来说这表明了用户一定很关心,发件人以及邮件的主题。

哈佛公开课 - 计算机科学课程节选

In a written reply at a court hearing, the interim government said that its mandate was limited to organising elections and tackling the security threats in the run-up to the polls.

BBC: Asia

Please do not use the USB key, and we ask that you return it to IBM at Reply Paid 120, PO Box 400, West Pennant Hills 2120.

FORBES: IBM Distributes Malware-Infected USB Sticks At Security Conference

Somerset's reply was struggling at 106 for four in the 27th over before Holloway and Burns revived the chase with a stand of 71 in 15 overs.

BBC: Johnson