问题描述：
A teacher has thirty pencils in the box.There are thirty children in the class.The teacher wants
to give one pencil to each child and he also wants to leave（留下）one pencil in the box.How does he do it?(You can answer in Chinese.
to give one pencil to each child and he also wants to leave（留下）one pencil in the box.How does he do it?(You can answer in Chinese.
问题解答：
我来补答展开全文阅读