Of course permanency has been a problem for artists since the first prehistory artist scratched into a chalk wall in a French cave.
当然，对艺术家来说，保存永久的艺术形式是一个问题，比如说，史前艺术家以前在山洞的石灰墙上创造作品，但现在不会有人这么做了。
我需要一些滑石粉。
When used for a time, the lock may not be opened smoothly. Do not dip mechanical oil into the lock. Instead, slip some French chalk or pencil fines into it.
锁具使用一段时间后，会出现开启不顺畅的现象，不要往锁心内滴机油，将滑石粉或铅笔心的细屑滑入锁心内即可。
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