This business is a cover for illegal activity.

表面上这是家商行，实质上从事非法活动。

youdao

Are you surprised that an associate editor under your editorship was actually responsible for this level of illegal activity?

对于在你担任编辑期间，一个助理编辑对这种程度的非法行为负有责任，你是否感到惊奇？

youdao

Breaking into computers or computer networks and using them as a cover for serious illegal activities is a common activity, so common that many people have the skills necessary to do it.

侵入计算机和计算机网络并在其掩护下进行严重非法活动是一种非常普遍的行为，甚至普遍到许多人都具备实现此类行为的必备技能。

youdao

Perhaps a threat to remove FDIC backing from a bank that is found guilty or pays a fine for illegal activity.

FORBES: J P Morgan Breached its Risk Limits More Than 330 Times in 2012

But black hat hackers may stay away from the tool for fear that using a cloud service for illegal activity could allow law enforcement to track their behavior.

FORBES: Moxie Marlinspike's CloudCracker Aims For Speedier, Cheaper Password Cracking

Runnymede Borough Council said it was concerned that its property had been used for illegal drug activity.

BBC: Addlestone 'overdose' crack house boarded up