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发表于:2018-12-07 / 阅读(53) / 评论(0)

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发表于:2019-01-11 / 阅读(88) / 评论(0)

2007年VOA标准英语（六月）

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发表于:2019-01-28 / 阅读(68) / 评论(0)

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In 1907, or so it has sometimes been written, Albert Einstein saw a workman fall off a roof and began to think about gravity. 1907年，反正有时候书上是这么写的，有个工人从房顶上掉了下来，爱因斯坦就开始考虑引力的问

发表于:2019-02-17 / 阅读(27) / 评论(0)

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acoustic resonators

aft engine vessel

air dielectric coaxial cable

amplification refractory mutation system