Searching for one man in this big city is like looking for a needle in a haystack. 在这座大城市里寻找一个人犹如大海捞针。
The staff speak as one man on this issue. 在这个问题上全体职员意见一致。
There is only one man qualified for the job. 仅有一个人能胜任这个工作。
I don't mind my daughter going out with a group, but I don't want her to be alone with one man. There is safety in number. 我不介意我女儿和小组一起外出,但我不愿意让她单独和一个男人在一起,人多安全。