社交媒体上的某些评论可能对年轻人非常有害。

Some comments on social media can be really ___toxic for young people.

别再理他了，他在网上简直是个毒瘤。

Stop interacting with him, he's pure ___toxic online.

医生警告说这种蘑菇的毒素含量很高。

The doctor warned that this mushroom has a high ___toxicity level.