People have been working with x-rays for about 30 years by this time.
到现在为止,人类和X射线打交道大约30年了。
麻省理工公开课 - 固态化学导论课程节选
0 This time I called it X. I hard-coded into it the value 10.
这一次我声明它为X,我把它赋值为。
哈佛公开课 - 计算机科学课程节选
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