Drowning is a silent killer.

溺水是一个沉默的杀手。

youdao

It's sometimes called "the silent killer" because it has no symptoms.

它有时也被称为“沉默杀手”，因为它没有任何症状。

youdao

The real silent killer of marriage is distancing yourself from your partner.

于婚姻而言，真正看不见的杀手是你与伴侣彼此之间渐行渐远。

youdao

Carbon monoxide is called the silent killer because people do not know it is in the air.

VOA: special.2010.02.02

Carbon monoxide poisoning is known as a silent killer.

VOA: special.2010.02.02

"Hepatitis B is the silent killer because most people who are chronically infected may not be aware of the infection."

VOA: standard.2010.07.26

The gas is known as the silent killer because it cannot be seen or smelt.

BBC: Carbon monoxide detector

Sedentary living is the most prevalent disease, biggest silent killer and greatest health threat facing developed countries.

BBC: Laziness will send us to an early grave

"A silent killer" - those are the words David Bull uses to describe his long-standing liver complaint.

BBC: Liver damage is 'silent killer' cirrhosis patient warns