The doctors couldn't understand why farmers would have lead in their blood, until Hao's mother, Wang Shuhong, told them about the factory.

直到周浩的母亲王淑冬告诉医生有关工厂的情况，医生们才理解为何农民的血液里会有铅。

youdao

And that is why the rest of the world still looks to us to lead.

这也是为什么世界上其他国家依然期待美国发挥领导作用的原因。

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So why does America lead in the fast-growing high-tech sectors, and why does Europe hold its own only in more mature industries?

那么为什么美国在快速增长的高科技领域领头，而欧洲仅守在它的更加成熟的工业中呢？

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Today we tell you about some new understanding of why cutting the main branch of a plant or tree can lead to better development.

VOA: special.2009.10.13

Again,getting rid of the negative does not guarantee us the positive, which is why already in the 1940s, wrote that most men lead lives of quiet desperation.

再强调一次，摆脱消极,不能保证我们变得积极，因此早在19世纪40年代，认为，大多数人都活在沉默的压抑中。

哈佛公开课 - 幸福课课程节选

Why does one lead to or entail the other?

它们如何彼此导引与承继？

耶鲁公开课 - 政治哲学导论课程节选

Next, in light of our shared picture of the most important attributes we wanted in our two products, each person was asked to specifically describe the parts of the project where they most wanted to take the lead and why.

FORBES: Become an Opportunity Maker With Others

Scientists of the day thought graphite was a form of lead--that's why we still call the stuff in pencils "lead, " even though it's graphite.

FORBES: Magazine Article

College football is the cash cow for major Division I athletic programs, and this is why the men who lead these programs are handsomely compensated.

FORBES: College Football Coaching Salaries Grow Astronomically Due to Escalating Media Rights Deals