afterward ad.后来，以后；
blackboard n.黑板；
board n.木板；板；
courtyard n. 庭院,天井；
discard vt.丢弃，抛弃，遗弃
例句：
I'll tell you what happened afterward.
我告诉你后来发生了什么事。
Soon afterward, many of those people started to settling down to become farmers.
不久之后，许多人开始安顿下来，当上了农民。
The menu was on a blackboard.
菜单在黑板上。
He chalked the message on the blackboard.
他用粉笔把这条消息写在黑板上。
On a blackboard, he drew five concentric circles.
他在黑板上画出五个同心圆。
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