我怀疑可能有某种非法勾当在进行中。
报纸的报道揭发了参议员的非法勾当。
That newspaper story blew the lid off the Senator's illegal business deals.
那家公司在做非法勾当，所以警察查封了它。
That company was doing illegal things, so the police shut it down.
如果不是为了干非法勾当，没有必要非法越境。
There is no need for illegal border crossings if you are not doing something illegally!
如果不是为了干非法勾当，没有必要非法越境。
There is no need for illegal border crossings if you are not doing something illegally!
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