He had a way of throwing Helen off guard with his charm when she least expected it.

他有办法用他的魅力让海伦在最意想不到的时候失去戒备。

《柯林斯英汉双解大词典》

The findings caught Carli off guard.

这些发现让卡利措手不及。

youdao

A pickpocket needs targets who are relaxed and off guard.

扒手需要放松警惕的目标。

youdao

(NO TRANSCRIPTS) The intensity of the quake, which rocked the city for more than a minute, caught many off guard.

VOA: standard.2009.09.07

At least since the eighteenth century, these lines have been singled out for their beauty and, considering that Milton is describing the hideous demons under Satan's control, the pastoral elegance of this little simile really catches us off guard.

至少从19世纪起，这些句子因为它们的美感经常被单列出来，并被认为是弥尔顿在描述撒旦控制下的可怕的恶魔,这个小比喻诗歌上的优雅,确实使我们毫无防备。

耶鲁公开课 - 弥尔顿课程节选

Baaderbank Analyst Robert Halver says the move caught many investors off guard.

VOA: standard.2010.05.19

Being caught off guard so easily was very unbecoming for such a seasoned veteran.

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The burial caught people off guard in Caroline County, which has about 30, 000 residents.

CNN: Sheriff: Tamerlan Tsarnaev's burial was handled properly

But even the other events reinforce the impression of a government caught off guard.

ECONOMIST: France