或者你可能被要求在家庭活动介绍一位演讲者或婚礼上做演讲，你的语言将需要感动人们或使他们发笑。
Or you might be asked to introduce a speaker at a family event or to speak at a wedding, where your language will be needed to move people or make them laugh.
新飞机的介绍使解释者想到——为什么在过去几十年航空旅行一点也没便快纳？
The introduction of the new planes got the Explainer thinking—why hasn't commercial air travel gotten any faster over the last few decades?
③正是通过这本书，使牛顿的微积分介绍到中国来。
This is the book [which] Newton's calculus was introduced [by the book] into China.
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