The erasers cost five cents each.
橡皮每个五分钱。
这些橡皮在出售吗？
Do you know why the erasers are worn?
你知道为什么橡皮会磨损吗？
There is a pen and two erasers on the desk.
课桌上有一支钢笔和两块橡皮。
There are two erasers and a pen on the desk.
课桌上有两块橡皮和一支钢笔。
The teacher beat chalk dust from erasers.
老师掸掉黑板擦上的粉笔灰。
The teacher beat chalk dust from erasers.
老师掸掉黑板擦上的粉笔灰。
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