小作文。
请你描述一下你的教室，要求条理清楚，意思连贯，语句通顺，不少于5句话。
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There are twenty desks and forty chairs in the classroom. There is a blackboard on
the wall. There's a map of China on the wall. The clock is on the wall, too. It's nine in
the morning. The students are having an English class. Lin Tao is in Row One. Lucy is next
to him. Han Mei sits between Jim and Lily. There is a new pencil-box on Han Mei's desk.
It's red.
答案不唯一
的定义域为（）。