1、 Walking,running,rollerblading,swimming,dancing,and jumping jacks are all forms of aerobic activity.
散步、跑步、滑旱冰、游泳、跳舞和跳伞都是有氧运动的形式。
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2、 Several moments went by, one of the big Jacks pawed at the ground with his hooves and another looked behind him, as if to check the rear for a surprise attack.
过了好一会儿，其中一只大公驴用蹄子刨地，另一只回头望向他，似乎在检查后面那只是否会突然袭击。
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