在化学实验中，我们需要小心处理溴这种腐蚀性液体。

We need to handle ___bromine with care in chemistry experiments because it's a corrosive liquid.

派对上没人想和他聊天，因为大家都知道他是个游手好闲的人。

No one wanted to talk to him at the party because they all knew he was a ___bum.