未免人多了，就有龙蛇混杂，下流人物在内。

And inevitably among so many boys there were low types too, snakes mixed up with dragons.

如果周围的人龙蛇混杂、或者是用那些更重的词可能导致指责(比如工作)，我们就更容易用一些没那么冒犯的词。

We're more apt to use less offensive terms in mixed company or in Settings where more offensive swear words might result in recrimination (such as work).