王平：好，那再说“抛铁锤”吧！
我若是抛铁锤，那么质量重心，也是唯一的质量重心，会沿完美抛物线运动，就像一颗网球。
If I throw up a hammer, then the center of mass and only the center of mass will just go along a perfect parabola as if it were just a tennis ball.
杰夫：“抛铁锤”是：运动员手持56磅重的带环铁锤，背后是一个像撑竿跳高用的撑竿支架。
Jeff: the throwing iron hammers is that the athletes hold iron hammers of 56 pounds with rings. Behind them is a pole stand similar to the stand for pole jump.
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