crack n. 破裂聲；爆裂聲
a crack of thunder雷聲
裂縫；縫隙
There's a crack in this cup.這只杯子有一條裂縫。
The door opened just a crack.這門只打開一條縫。
分裂；裂開;突然的重?fù)?試圖；嘗試
He said he didn't know how to swim but would take a crack at it.\他說他不會游泳，但將盡力嘗試。
笑話；玩笑；閑談;（嗓子的）變音，粗啞
criterion n. (批評判斷的)標(biāo)準(zhǔn), 準(zhǔn)據(jù), 規(guī)范
cross twist 順手捻，S捻
a crack of thunder雷聲
裂縫；縫隙
There's a crack in this cup.這只杯子有一條裂縫。
The door opened just a crack.這門只打開一條縫。
分裂；裂開;突然的重?fù)?試圖；嘗試
He said he didn't know how to swim but would take a crack at it.\他說他不會游泳，但將盡力嘗試。
笑話；玩笑；閑談;（嗓子的）變音，粗啞
criterion n. (批評判斷的)標(biāo)準(zhǔn), 準(zhǔn)據(jù), 規(guī)范
cross twist 順手捻，S捻