What is the center of gravity?

谜语：What is never used until it‘s broken?谜底：An egg....

谜语：什么“屎”不臭？谜底：答案：天使...

谜语：抹了沐浴露的澡帕味道格外好闻打一花名谜底：郁金香（浴巾香）...

谜语：有一种东西，上升的同时会下降，下降的同时会上升。请问这是什么？谜底：答案：翘翘板...

谜语：颗粒归仓核实产量(打一成语)谜底：精打细算...

谜语：八戒出现在太阳升起的一处打一歌曲谜底：ktv必点歌曲之一：《东方之珠》——罗大佑...

谜语：A policeman saw a truck driver going the wrong way down a one-way street, but didn‘t give him a ticket. Why?谜底：Becaus...

谜语：什么时候棉花比盐重？谜底：答案：棉花浸水后。...

谜语：What stays indoors no matter how many times you put it out?谜底：The light....

谜语：什么鱼不能吃？谜底：答案：木鱼...