旧图书馆发霉的气味让我想起了被遗忘的书籍。

The musty ___odor of the old library reminded me of forgotten books.

刚熄灭的香烟气味令人难以忍受。

The ___odor of recently put-out cigarettes was overwhelming.

化学品泄漏释放出有毒气味，迫使该区域疏散。

The chemical spill released a noxious ___odor that forced the evacuation of the area.