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。

youdao

Only with “Couples” (1968), his fifth novel, did Mr. Updike move his setting away from Pennsylvania, to the fictional Tarbox, Mass.

在他的第五部小说《夫妇们》（1968）中，他把场景从宾西法尼亚搬到了虚构的城市塔博斯（Tarbox，Mass)。

youdao

Of course, humanity is currently setting off the sixth mass extinction event in Earth's history.

当然，人类正在引发地球历史上第6次物种大灭绝。

youdao

Later Pope falls in his own trap while setting off flares to mark their arrival to a 2nd Mass camp.

FORBES: Spielberg's Falling Skies Not So Original

He told delegates that steps such as setting tighter rules on car emissions, regulating for energy efficient goods and building urban mass transit systems are already having an impact that can be measured.

BBC: Climate ship plots course through the battering waves