For this one, we also say smells fishy – a phrase I think is even better.

对于这个单词，我们会用“smells fishy”——我认为这个词组更好一点。

We used to say, " Something smells fishy" .

我们曾经说过，“有东西闻起来有鱼腥味”。

Things like long chain amines have a fishy or rotten smell, and some people say that long chain carboxylic acids smell like goats.

长链胺之类的东西有腥味或腐臭味，有人说长链羧酸闻起来像山羊。

The whole thing is beginning to smell fishy to me.

【smell】我开始感到这整件事有可疑。

The color will change slightly to like a greenish yellow, and you will immediately start smelling fishy, kind of like seafood smell.

颜色会略微变成黄绿色，你会立即开始闻到鱼腥味，有点像海鲜味。