When learning computer programming, I found it helpful to look at a function like a pencil sharpener. A parameter was a dull pencil, inside processes sharpened and returned a sharp pencil.
我在学编程时，常把程序比作卷笔刀，而把参数比作钝铅笔，经过处理我们就得到尖铅笔了。
Suddenly there were swords everywhere: fat swords, skinny swords, sharp swords, dull swords, fancy swords, but mostly tiny swords so that one man might carry many of them.
商人们忙碌了起来，一时间到处都是卖剑的，剑身有宽有窄，剑刃或利或钝，亦有的宝剑花哨夺目，卖得最多的是袖珍的宝剑，唯有这样一个人才能佩戴很多把。
The discomfort may be sharp or a dull ache that gets worse towards the end of the day.
疼痛的感觉可能是剧烈而快速的，也可能是持续恶化的很久的钝痛。
Sharp knife sheath to protect themselves, it is satisfied with its dull. — Tagore.
刀鞘保护刀的锋利，它自己则满足于它的迟钝。——泰戈尔。
Everyone knows that a sharp knife cuts better than a dull one, but do you know why, exactly?
大家都知道锋利的刀刃的切割性能胜过钝刀，但您知道确切原因吗？
A sharp crack might remain fairly sharp in granite, but degenerate into a dull thud in sand.
在花岗岩中尖锐的破裂声可以保留相当的强度，而在砂岩中则易变成低沉的轰响。
Dull tools can be more hazardous than sharp ones, since it takes more force to cut with a dull blade.
钝工具比锋利工具更为危险，因为使用钝刀片切割需用更大的力气。
This invariably wins him the admiration and respect of students, for he adds colour to the dull class with a sharp sense of humor.
他总是赢得同学们的钦佩和尊敬，因为他以极强的幽默感为我们平淡的课堂增添了色彩。
If you are chopping wood in your dream with a sharp axe you will meet a new companion but if the axe is dull, you will not be able to depend on this person.
如果您是斩木在自己的梦想与夏普开刀，你会满足一个新的伴侣，但如果开刀是枯燥乏味，你将无法依赖于这个人。
The scabbard protection sword sharp, itself is content to be dull.
⊙、刀鞘保护刀的犀利，它自己则满足于它的迟钝。
The scabbard protection sword sharp, itself is content to be dull.
⊙、刀鞘保护刀的犀利，它自己则满足于它的迟钝。
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