And then, they put their fingers at the top of the black board.

然后把手指放在黑板最上方。

This means you can simply wash away all the mistakes you made from the past year, as one would remove chalk from a school black board.

这意味着你可以轻而易举地把过去一年里犯过的所有错误都一笔勾销，就像从学校的黑板上擦掉粉笔字一样。

The first object with which they had an association, or of which they had a remembrance, was a large black board with a dry Ogre chalking ghastly white figures on it.

他们联想到的第一个对象，或者说他们记得的第一个对象，是一块大黑板，上面有一个干巴巴的食人魔，用粉笔写着可怕的白色数字。