心脏病是苏格兰的头号杀手。

Heart disease is the biggest killer in Scotland.

《牛津词典》

过量浇水是杀死室内盆栽的头号杀手。

Overwatering is the no. 1 killer of houseplants.

youdao

心脏病现在是健康的头号杀手，但是作为同谋我们是有罪的。

Heart disease is now our no. 1 killer, but we're guilty as accessories to the crime.

youdao

Why is cancer one of the leading killers in the U. S. now but wasn't even on the charts in 1665?

为什么癌症现在是美国人的头号杀手,却甚至没有在一六六五年的名单中出现

耶鲁公开课 - 生物医学工程探索课程节选

I'd like to ask you what the biggest killer was in 1900. What-- which of these things took the most lives in the United States?

你们认为1900年时的头号杀手是什么,哪一项在美国的致死人数最多

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选