1.
Idleness turns the edge of wit.
刀不磨变钝，人不勤变笨。
2.
He turned the edge of the knife.
他使刀口卷刃[变钝]。
3.
This cheap knife dulls easily.
这把便宜的刀容易变钝。
4.
To become dull or blunt by bending back. Used of the edge of a cutting instrument.
使变钝因向后弯曲而变钝。用于切割工具的刃
5.
The hardest knife ill-used loses his edge. --William Skakspeare
使用不当，利刃也变钝。——莎士比亚
6.
become dull or lusterless in appearance; lose shine or brightness, as of a varnished surface.
涂漆的表面，呈现出变钝或没有光泽，失去光泽或光亮。
7.
If you keep using that chisel as a screwdriver you'll take the edge right off it.
如果你总把那凿子当螺丝起子用，就会使它变钝的。
8.
To make or become dull.
使变迟钝，使变麻木，使不鲜亮
9.
Her eyes glaze over when she is bored.
当无聊的时候，她的眼力变得迟钝。
10.
My head became heavy after a whole day' s meeting.
开了一整天会我的头脑变迟钝了。
11.
My head was heavy after a whole day's exams.
考试考了一整天, 我的头脑都变迟钝了.
12.
They were clumsy and slow.
他们都变得手脚不灵，动作迟钝。
13.
His eyes were glazed in pain.
他的眼睛因痛苦而变得钝滞。
14.
Without self reflection, a man will become stagnant.
一个人不经常反省，头脑会变得迟钝。
15.
His hearing was dulled by age.
他的听觉因上了年纪而变得迟钝了。
16.
Grief has blunted her senses.
悲伤使她变得迟钝麻木了。
17.
Middle age dulled her appetite for travel.
中年的年龄使他的对旅行的欲望变得迟钝。
18.
Your own obsession with false-imbalances has made you lethargic and hypocritical.
对于不平衡的执著使你变得感觉迟钝并且伪善。