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因此在第一秒内,速度根据时间而变化。
And so during the first second this is the velocity as a function of time.
youdao
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首先在第一秒钟内，在第一秒内。
Let's first take the first second, during the first second.
youdao
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首先在第一秒钟内，在第一秒内。
Let's first take the first second, during the first second.
youdao