许多教师只将黑板作为书写之用。但是,在黑板上画一些简单的图画却能提高学生们的兴趣,同时这也是解释含义、描绘情景的一种很好的方法。
Many teachers use the blackboard only for writing. But simple pictures drawn on the blackboard can help increase the interest of the lesson, and are often a good way of showing meaning and conveying situations to the class.

Here are some tips for board drawing. Can you fill in the gaps?

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Glossary
involve (v.)   使参与
simple (adj.)   简单的