你能跳多高？
Flea1） trainers have observed a strange habit of fleas while training them.Fleas are trained by putting them in a cardboard box with a top on it.The fleas will jump up and hit the top of the cardboard box over and over and over again.As you watch them jump and hit the lid，something very interesting becomes obvious.The fleas continue to jump，but they are no longer jumping high enough to hit the top.
When you take off the lid，the fleas continue to jump，but they will not jump out of the box.They won't jump out because they can't jump out.Why？The reason is simple.They have conditioned2） themselves to jump just so high.Once they have conditioned them－selves to jump just so high，that's all they can do.
Many times，people do the same thing.They restrict3） themselves and never reach their potential4）。Just like the fleas，they fail to jump higher，thin king they are doing all they can do.
跳蚤訓練人在訓練時發現跳蚤有一個奇怪的習慣。訓練時，跳蚤被放在有頂蓋的紙板盒里。跳蚤會不斷地跳起來，撞擊頂蓋。你觀察它們跳起來撞擊頂蓋，會慢慢注意到一個有趣的現象。它們仍不斷地往上跳，但不會再撞到頂蓋。
當你把頂蓋拿開時，跳蚤還會接著跳，但不會跳出盒子。它們不會跳出來是因為它們已經跳不出來了。為什么？原因很簡單。它們已經習慣于只跳這么高了。而一旦習慣于只跳這么高后，它們就只能跳這么高。
很多時候，人們也是一樣。他們自己限制自己，從來不去努力開發自己的潛力。就像跳蚤一樣，他們沒有能夠跳得更高，還以為已經把自己的能力發揮到了極限。
1. flea n. 跳蚤， 低廉的旅館，生蚤的動物
2. condition vt. 以……為條件， 使達到要求的情況
3. restrict vt. 限制， 約束， 限定
4. potential n. 潛能， 潛力， 電壓
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