班门弄斧: display one's slight skill before an expert; be conceited; display one's incompetence before a connoisseur; go to teach hewing to the god of carpenters; show off before a superior man; sho
不要班门弄斧: do not teach fish to swimdo not try to teach your grandmother to such eggsdon't try to teach fish how to swimnever offer to teach fish to swim
切勿: be sure not to 短语和例子切勿倒置 do not turn over; keep upright; 切勿干燥 keep wet; 切勿受潮 keep dry; 切勿投掷 no dumping; no shooting; 切勿压挤 do not crush; 切勿坠落 do not drop; no dropping; 切勿听信谣言。 don't believe
切勿倾倒: do not turn upside downkeeuprightno turning over
