We've had 'purging' — removing something considered harmful.

我们学了“清除”——移除被认为有害的东西。

They say tritium is not considered harmful in small amounts.

他们表示，少量的氚不被认为是有害的。

They have suggested that differing definitions of what is considered harmful to children could result in minors being blocked from important information.

他们表示，对儿童有害的信息定义不同，可能会导致未成年人无法获得重要信息。