More specifically

The overrid gear of the optical drive rotates when you push it. When it rotates, it is almost impossible to avoid the teeth from hitting the pencil lead. Even if the lead doesn't break at the time it is pushing the gear, it will definitely break when the gear teeth hit it unless it is really thick and tough.
In fact, I don't see any possiblity for most people to have "thick and tough" pencil refill at home.

所有跟帖： 

• 实在好笑，费点神回你一下： -ppzcgg- ♀ (1344 bytes) () 04/25/2005 postreply 21:49:42

• grant 是出名有点问题的人，看看他一下发了多少帖子。 -但是挺可笑唉- ♀ (18 bytes) () 04/25/2005 postreply 21:53:02

• 处处可乐 -处处可乐- ♀ (40 bytes) () 04/26/2005 postreply 22:01:48