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当秘诀时，是个集合名词，只有单数形式。你可以看做不可数，因为它永远以单数形式出现的，放心，而且谓语动词永远是单数可数名词 A secret is a fact that is known by only a small number of people, and is not told to anyone else. 秘密例：I think he enjoyed keeping our love a secret.我想他喜欢对我们的恋情保密。5.单数型名词 If you say that a particular way of doing things is the secret of achieving something, you mean that it is the best or only way to achieve it. 秘诀例：The secret of success is honesty and fair dealing.成功的秘诀是诚实和公平交易。
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