So what I'm saying here is we are specializing to a limited class of motion where the particle has a definite acceleration, a.
我在这里想说的是,我们正在专门讨论一类问题,这些问题中,质点都有一个确定的加速度a
but I do want to be a film director specializing in, like, thrillers, kind of horror.
但我希望能够成为专门拍摄惊险或恐怖片的导演。
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