问题补充说明：It is a part of our life.It has on leg.But it can walk day and night.What is it? heart是什么意思？not clock中文意思是什么？
earth地球自转
标签：what
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问题补充说明：It is a part of our life.It has on leg.But it can walk day and night.What is it? heart是什么意思？not clock中文意思是什么？
earth地球自转
标签：what
