The nature of the polymer is currently a trade secret.

该聚合物的属性目前是个行业秘密。

《柯林斯英汉双解大词典》

The recipe for their drink is a closely guarded trade secret.

他们饮料的配方是严格保守的商业秘密。

《牛津词典》

We still have the question of how they have discovered the trade secret.

我们仍对他们如何发现这商业机密怀有疑问。

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