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。

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。

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。

"It's a trade secret," he said.

这是商业机密，“他这样说道。”

This is our trade secret.

这是我们的商业秘密。