为何省略they are?
答：这是when引导的时间状语从句的省略形式.
这句话中,从句补充完整即为when they are climbing the tree.主句主语是They,从句主语也是they,且包含be动词are,所以要省略.
什么情况下可以省略?
答：状语从句的省略满足两个条件即可：①主句和从句的主语一致②从句中有be动词即am,is,are.从句中的主语和be动词就省略.
语法：They have long tails for keeping balance when climbing th
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