单词	center of mass
释义	center of mass noun phrase : the point in a body or system of bodies at which the whole mass may be considered as concentrated Word History First Known Use 1862, in the meaning defined above
随便看	lock time lock tortoise lock turtle lock up lock washer lock's lungwort lock's oriole lock, stock, and barrel lock-and-block system lock-grained lock-in lock-ins lock-joint lockable lockage lockages lockaid gun lockbox lockboxes lockdown lockdowns Locke lockean Lockeanism locked

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