尾部阻力

main drag───n.要道，主要街道；毒贩及娼妓的活动地区

tails away───变少；缩小；减弱

trails away───逐渐减弱；（声音）减小到听不见

in drag───男扮女装

main drags───n.要道，主要街道；毒贩及娼妓的活动地区

nails down───确定，明确；用钉钉住

tail away───变少；缩小；减弱

Without warning, they explode from the water with a thrash of their powerful tails and drag their victim-water buffalo, monkey, shark-under water.───它们会在毫无征兆的情况下，突然用其强有力的尾巴击打水面，然后将猎物——如水牛，猴子，鲨鱼等——拖入水底。