Julia says there's a faint smell something nasty in there, but she doesn't think it permeates through the rest of the building.

朱莉说那有股微弱的难闻气味，但她认为它会渗透到大楼的其他地方。

There is a faint smell of something nasty in there, but I don't think it permeates through the rest of the building, do you?

朱莉：有股微弱的难闻的气味，但我认为它会渗透到大楼的其他地方， 是吗？

Giles says that he doesn't think the nasty smell permeates through the rest of the building, but there are different nasty smells in other parts of the building.

吉尔斯说他认为难闻的气味会渗透到大楼的其余部分，但大楼的其他部分有同的难闻气味。