There is a sickly smell.

有一股令人作呕的气味。

There may be a sweet sickly smell of ketosis in cattle.

牛的酮病会有一种甜而令人讨厌的气味。

It gave off a sickly, oily smell.

它有一种令人难受的油味儿。

He took down from the shelf a bottle of colourless liquid with a plain white label marked VICTORY GIN. It gave off a sickly, oily smell, as of Chinese rice-spirit.

他从厨架上拿了瓶无色液体，瓶身上一块纯白标签写着“胜利牌琴酒”。