汉语成语的英译可以用google在网上查。8 U; `+ I! D+ T1 l; b* K9 X. L. c
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(不要)班门弄斧:Never offer to teach fish to swim, or Don't teach your grandmother to suck eggs. ( D3 Q* E7 D5 c3 J! B1 h$ I7 [( Z0 B
抛砖引玉: To throw out a minnow to catch a whale.