About one-third of Southern white families at one time or another had at least a toehold in slave ownership.
大约三分之一的南方白人家庭,在某一段时期至少都拥有过奴隶
Roughly 25% of you are likely to end up with some kind of an A at the end of the semester.
大概有四分之一的人,以90分或者更高而结束。
During this part, when you're doing a quarter of a circle, this is supposed to be a quarter of a circle.
在这部分,当你沿着四分之一圆运动,这就是个一个圆的四分之一
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