说他在从事非法活动无任何根据。

There was no suggestion that he was doing anything illegal.

《牛津词典》

同时，他们也可以打破非法挖掘机对市场的控制，从而减少从事非法活动的诱因。

At the same time, they would break the illegal excavator's grip on the market, thereby decreasing the inducement to engage in illegal activities.

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表面上这是家商行，实质上从事非法活动。

This business is a cover for illegal activity.

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