I don't like jumping, so I am weak in the high jump.
我不喜欢跳跃，所以我在跳高方面很弱。
As you watch them jump and hit the top, you will notice something interesting. The fleas continue to jump, but they are no longer jumping high enough to hit the top.
当你观察它们跳跃并且撞到盖子的时候，你会发现一件有趣的事情，跳蚤会继续跳，但是它们不再跳到能撞到盖子的那个高度。
"I could never jump really high until I worked really hard on my jumping, " Alexander said.
我从来不可能跳很高，直到我拼命练习弹跳。
Some alternatives to foot work would be a double under (jumping high in a tuck jump position and turning your hands fast so the rope will go under twice before you land).
高高跳起然后快速交叉双手使得绳索在你落地前交换2次。
Some alternatives to foot work would be a double under (jumping high in a tuck jump position and turning your hands fast so the rope will go under twice before you land).
高高跳起然后快速交叉双手使得绳索在你落地前交换2次。
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