单词	Bertrand lens
释义	Bertrand lens noun : an auxiliary removable lens in the tube of a polarizing microscope used to obtain interference figures Word History Etymology probably after Joseph L. F. Bertrand
随便看	kneeing kneel kneeled kneeler kneelers kneelet kneeling kneelingly kneels kneepad kneepads kneepan kneepans knees knees-up kneesie kneesock kneesocks kneestone Kneiffia kneipes kneipp cure kneipp's cure Kneippism knell

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