The barn went to wrack and ruin after the farmer moved.那农夫搬走之后,谷仓就废弃了.The wrack of the city was still hot from the fire.这城市的残骸,仍因火灾还是热的.black wrack墨角藻The wrack had begun to stink as it rotted in the sun.海草残骸在阳光下腐烂,开始变臭了....
The next estrus was delayed.下一次发情推迟了.A cow's estrus cycle averages 21 days.母牛的发情周期平均为21天.Anestrus ( absence of estrus ) is not a disease but a sign of a variety of conditions.乏情不是一种疾病,而是一种多方面的体态迹象....
Will you nail down that loose board in the floor?请把那块松动的地板钉牢好 吗 ?It would be useful if you could nail down the source of this tension.如果你能弄清这种紧张的根源，将会大有益处。It took the negotiators ten hours to nail down a deal.参加协商的人花了十个小...
flight vehicle propulsion system飞行器推进系统The nineteenth century witnessed a revolution in ship design and propulsion.19世纪船舶设计和船舶动力领域发生了重大的变革。...the submarine's propulsion system.潜水艇的推进系统Adduction of the upper arm to m...