To get something better, sacrifice is a must.

为了得到更好的东西，牺牲是必须的。

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Whenever you have an aim you must sacrifice something of freedom to attain it.

无论何时，只要有目标，你就要牺牲一定的自由以达到它。

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Explorers will sacrifice some of that relaxation for the opportunity to find something they haven't seen before.

探索者则会牺牲消遣的机会去寻找他们之前从没看过的东西。

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Or if you want to tolerate negative numbers, you've got to sacrifice something.

如果你想也用来表示负数呢？,你不得不拿出一部分来表示。

哈佛公开课 - 计算机科学课程节选

So if you go back to Eisenhower, for instance, he said anyone who had seen the sacrifice and the blood of his friends has got to be humble, has got to understand humility, s something so much larger than we are.

如果回到艾森豪威尔时期，他说任何人,凡是见过朋友牺牲流血,都必须谦逊，都必须理解为何谦逊，因为相对而言，我们很渺小，because，it’

普林斯顿公开课 - 国际座谈会课程节选

We unite, recognizing that such crises call on all of us to act, recognizing that there but for the grace of God go I, recognizing that life's most sacred responsibility -- one affirmed, as Hillary said, by all of the world's great religions -- is to sacrifice something of ourselves for a person in need.

WHITEHOUSE: President Obama Speaks at National Prayer Breakfast

She noted that a return to the draft is something Rangel has long championed to promote shared sacrifice.

CNN: Pelosi says no to draft legislation

This history suggests that something about suffering and self-sacrifice appeals to the scientific mind.

WSJ: Mars One and the Scientific Embrace of Suffering