One is if you have to coordinate how you're going to give this vaccine to two million children across the U.S.
首先必须协调合作,如何才能将疫苗,分发给全美国二百万孩子
How do the components of A in the new rotated coordinate system relate to the components of the old coordinate system?
在旋转后的新坐标系中 A 的分量,和原始坐标系中 A 的分量有什么关联呢
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