Let's do an example. Let's try to figure out if we have just a uniform disk how hard it is to spin it around its center.
还是看个例子吧，有一张均匀的唱盘，让它绕中心旋转有多难呢？
Its just a short reminder to all of you working so hard in life.
这只是对在生活中辛苦工作的所有那些人的一个简短的提醒。
Its just a short reminder to all of you working so hard in life.
这只是对在生活中辛苦工作的所有那些人的一个简短的提醒。
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