If we have to compute a line integral, we have to do it by finding a parameter and setting up everything.
如果我们必须计算线积分，就必须通过寻找一个参数，并建立起一切。
Setting a personal example has been integral to her approach to this behavior-based problem. Hence her White House garden, which she hopes will serve as a model for communities and families alike.
以身作则是处理这一基于行为问题不可或缺的办法，她希望今后她的白宫花园可以成为社区和家庭的典范。
So, instead of setting up the integral with bounds and integrating dx dy or dy dx or in polar coordinates, I'm just going to say, well, let's remember the definition of a center of mass.
那么我们将不会建立带上下限的积分，和积分dx, dy, dy, dx或者在极坐标做线积分，需要说，让我们回忆一下质心的定义。
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