He found evidence of the use of child Labour and illegal working hours, along with concerns over the use of poisonous chemicals.

他发现关于雇佣童工的和不合法的工作时长的证据，还有所担心的使用毒物质。

youdao

The illegal payments were discovered by a journalist working undercover.

这些非法付款是一位暗中查访的新闻记者发现的。

《牛津词典》

Illegal loggers working for outside companies come here, destroy everything and leave.

非法伐木者为外来的公司工作，破坏了一切然后离开了。

youdao

There is illegal working.

BBC: Hounslow rough sleepers arrested in Border Agency raid

There are currently somewhere between 8m and 12m illegal immigrants working in the United States, half of them from Mexico.

ECONOMIST: At last, sense about illegal workers

It is, however, very unlikely the courts would strike down any effort by Congress to prohibit illegal residents from working or obtaining welfare benefits, including federal efforts to solicit or entice the states to cooperate in such efforts through the use of federal grants and mandates.

FORBES: E-Verify: Another Federal Assault On Freedom