中英释义：
双语例句
看！那儿有一只猫正在爬树。
Look! Where there is a cat climb a tree.
听录音，然后回答问题。猫正在爬树吗？
Listen to the tape then answer this question. Is the cat climbing the tree?
重点词汇
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正在
in the process of; in the midst of; at the moment; in course of; in the act of; currently; presently
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爬树
climb a tree