limit/limited/unlimited/restrict/edge/border
记忆：
1. limit [ 5limit] n. 界限, 限度, 限制 vt. 限制, 限定 Girls can push the limit set by boys. 女孩能提高男孩创下的纪录。
2. limited [ 5limitid] adj. 有限的, 狭窄的 As a matter of fact, everyone can only have limited freedom, for you have no right to trouble other’s legal freedom. 实际上，每个人只能有有限的自由，因为你无权干扰别人的合法自由。 格言： One's life is limited, but learning is endless. 生命有限，学海无涯。
3. unlimited [ Qn5limitid ] adj. 无限的, 无约束的 Unlimited power will surely result in corruption. 无约束的权利必然会产生腐败。
4. restrict [ ris5trikt] To keep or confine within limits. re-strict vt. 限制, 约束, 限定 He has to restrict himself to two cigarettes a day. 他不得不限制自己每天只抽两支烟。
5. edge [ edV] n. 刀口, 边缘 The sharp edge of the leaf cut my fingers. 叶子锋利的边缘划伤了我的手指。
6. border [ 5bC:dE ] n. 边界, 边沿 vt. 与. . . 接壤, 接近 You can’t cross the border without permission. 未经许可你不能越过边界。
另类阅读：
Seated at the edge of the table, he thought life is restricted with borders. Meanwhile, knowledge is unlimited. So he must try his best to learn as much as possible.