He showed up at Zeng's home the next day with a blackboard, a ruler and a box of chalks.
第二天，他带着一块黑板、一把尺子和一盒粉笔来到曾的家里。
The box itself opens up into a sort of blackboard.
这种箱子自身在打开之后，就变成了一个黑板模样。
There is a box fixed beneath the chalk rail of the blackboard.
黑板下方横木条底下设有一个盒子。
There is a box fixed beneath the chalk rail of the blackboard.
黑板下方横木条底下设有一个盒子。
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