Well, this shows what happened in the period after this vaccine was introduced into the general population so that would have been in 1954.
这表明了,疫苗在一九五四年,引入大众后的一段时间内,发生了什么样的情况
Second formula tries to relate the final velocity of some time, t, to the initial velocity and the distance traveled with no reference to time.
第二个式子能把某段时间t的末速度,和初速度,经过的路程联系在一起,并且不引入时间
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