s ：learn something,understand it or know it well
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s：learnsomething,understanditorknowitwells：learnsomething,understanditorknowitwells：learnsomething,u
s ：learn something,understand it or know it well
s ：learn something,understand it or know it well
s ：learn something,understand it or know it well
学会某事
明白它
很熟悉它
是翻译吗,