九牛一毛 九牛一毛的英文 英语翻译 a drop in the sea; a drop in the bucket; a mite on an elephant 拓展翻译 九牛二虎之力tremendous effort九nine; manynona-九倍的ninefold九边形nonagon九产妇nonipara九的补数nine's complement九点公式nine-point approximation九二gibberellin九个nine九角形ninogan九节碱psychotrine九节因cephaeline九聚物nonamer九里热nine-mile fever九里香草Murraya exotica L.九留仓中物bin hang-up九泉the nether world九日红斑Milian's erythema; ninth-day erythema九十ninety九死一生a near escape; a near touch; escape from death