我们有充足的理由相信，燃烧化石燃料使当前的人类正在沿着一条相似的轨迹前进——只不过这一次动作要快得多。
There is every reason to believe that, by burning fossil fuels, humans are charting a similar course today-only this time in fast motion.
游泳运动员在空中时，身体重心的运动轨迹一经确定，就不会因为任何一种身体动作而有所改变。
Once a swimmer is in the air the trajectory of the center of gravity is set and cannot be changed by any body movements.
识别鼠标轨迹的小程序，可以用鼠标的动作来控制电脑的操作。
Identification of the mouse trajectory applet can be used to the mouse movements to control computer operations.
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