身材瘦削而且训练艰苦的女运动员行经可能不那么频繁，或者根本不来月经。Lean hard-training women athletes may men-struate less frequently or not at all.妇女的平均月经周期是28天。The average length of a woman's menstrual cycle is 28 days.她于13岁开始有正常的月经,周期为28～32天,有轻度的...
He has devised a process for making gold wires which neither corrode nor oxidise.他设计了一种能够避免腐蚀或氧化的金丝制作流程。He has devised a process for making gold wires which neither corrode nor oxidise...他设计了一种能够避免腐蚀或氧化的金丝制作流程。The carbon...
His was a rags-to-riches story and people admire that.他白手起家，人们对他都很钦佩。She'd managed to strip the bloodied rags away from Nellie's body.她已经设法将内利身上沾满血污的破烂衣衫脱掉了。skeletal figures dressed in rags衣衫褴褛、骨瘦如柴的人...
制革工人硝皮以制作皮鞋.Tanners tan hides to make leather shoes.含有与氮原子相连的硝基的物质称为硝胺.Nitramines are substances which contain a nitro group bonded to nitrogen.较好的配方是那些高硝基增塑的硝化棉粘合剂配方.The preferred compositions are the highly nitroplasti...
你可以到街那头的加油站试试。You might try the gas station down the street.别忘了到加油站顺便加油.Don't forget to stop by at the gas station.一场长途跋涉后, 我们终于赶到了加油站.After a long journey, we got to a petrol station at last....