诗歌中常把日、月拟人化.The sun and the moon are often personified in poetry.人们往往用 “ 她 ” 来称呼船使之拟人化.People usually personify a ship by referring to it as'she ".动物常在童话中被拟人化.Animals are often personified in fairy tales....
即使是在这种情况下,运动方程也是不能精确积分的.Even in this case the equations of motion cannot be integrated exactly.这几乎省去求解积分的一半劳动.This cuts the labor of evaluating integrals almost in half.我们可利用积分的可加性.We can use the additive property of the...