It's like being a high jumper: you want to keep raising the bar until you knock it down, otherwise you don't know how high you can jump.
就像跳高比赛：在你撞到那条横杆之前你总是会努力让它升得更高，否则你不会知道你到底能跳多高。
你能跳多高？
How High Can You Jump flea trainers have observed a strange habit of fleas while training them.
你能跳多高？跳蚤训练人在训练时发现跳蚤有一个奇怪的习惯。
How High Can You Jump? Flea trainers have observed a predictable and strange habit of fleas while training them.
跳蚤训练人在训练跳蚤时发现跳蚤有一个奇怪的习惯。
How High Can You Jump? Flea trainers have observed a predictable and strange habit of fleas while training them.
跳蚤训练人在训练跳蚤时发现跳蚤有一个奇怪的习惯。
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