Three men were arrested and one was under guard in hospital.

有3人被逮捕，1人在警方监护下送医院治疗。

柯林斯例句

The criminal has been sent to the county seat under guard.

这个罪犯已经解到县里去了.

《现代汉英综合大词典》

The institution was under guard when art exhibit was there.

艺展举行时,展馆是有人看守的.

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