bān mén nòng fǔ
- teach one's granny how to suck eggs
- display one's slight skill before an ecpert
- show one's slight skill before an expert
- offer to teach fish to swim
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eightpence,
eightpenny,
eights,
eightscore,
eightsome,
eight-square,
eight-wheeler,
eighty,
eighty-niner,
eighty-six，86,
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班鸠,
班轮,
班轮条件,
班轮运输,
班蝥,
班门弄斧,
班尼路,
班尼特,
班期,
班师,