我不知道这些化学剂是否可能包括笑气或不良气味，但可以肯定的，这不像是在开玩笑。

I've no idea whether these agents might include laughing gas or bad odours, but it certainly sounds like no laughing matter.

youdao

我不知道这些化学剂是否可能包括笑气或不良气味，但可以肯定的，这不像是在开玩笑。

I've no idea whether these agents might include laughing gas or bad odours, but it certainly sounds like no laughing matter.

youdao