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

朱莉娅说那里有一股微弱难闻，她认为它会渗透到其他地方。

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?

朱莉娅：里面有一股微弱难闻，我认为它会渗透到其他地方， 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会渗透到其余部分，其他部分有同难闻。