A heavy object, like a football player moving at a high speed, has a lot of momentum—that is, once he is moving, it is hard to change his state of motion.
2
而且，虽然有源系统的传感器可以通过电池供电，但促动器就不能移动重物。
And although the sensors in active systems can be powered by batteries, the actuators that move the heavy weights cannot be.
3
这说明这些球完全可以用来运送重物，从而弄清楚那些巨石是如何被移动的。
This proved the balls could move large heavy objects and could be a viable explanation of how giant stones were moved.
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