I should not leave my briefcase and camera bag unguarded.我不该把公文包和相机包丢在那儿无人看管。

He was ambushed by a reporter into an unguarded comment.他一不小心被记者套出话来。

In an unguarded moment, he admitted the firm would need to borrow money.他一不留神说漏了嘴, 承认公司需要借贷。

The photographers managed to capture Jane in an unguarded moment.摄影师们抓拍到了简不经意的瞬间。