Ménkǒu zhàn zhe yí ge nánde, hǎoxiàng zài děng rén.
There's a man standing at the door; he seems to be waiting for someone.
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男的 is plain everyday speech for "a man" and can sound blunt, especially about someone present. 男士 (gentleman) is polite and 男性 (male) is neutral and formal. The female counterpart is 女的.