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And as I'm going to do many times in 3.091, I'm going to start a unit like this with a history lesson.
在3。091这门课上我会重复很多次，我会像现在一样以一个历史的故事,来开始新的一单元。
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It is not an SI unit because it is not a multiple of 10 to the 3rd, but I like the angstrom.
它不是国际制单位，因为它不是,10的3次方进制，但我还是喜欢这个单位。
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You can pick your unit vectors, or what are called basis vectors, any way you like.
你可以任意选取单位矢量,或者也可以叫做基矢量,这都随便你
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It's like the unit vector i.
它就像单位矢量 i
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