In this paper, a discrete stage - structured epidemical model is proposed and studied.本文主要讨论了离散的阶段结构传染病模型.OBJECTIVE To explore the administration measures of air condition usage in SARS epidemical period.目的研究传染性非典型肺炎流行期间...
Ball Joint Handrailing is one good type of the handrails.球接栏杆是栏杆的一种较好的型式.Posts for removable handrailing shall be secured to the sleeve.移动扶手的标杆要保证套筒的安全....
He was a charming mixture of glum and glee.他是一个很有魅力的人，时而忧伤时而欢笑。How pleasant it is to dine on fine well-cooked fish and fresh vegetables,in such charming surroundings!在如此令人陶醉的环境中,能吃上精心烹调的鱼和鲜嫩可口的蔬菜该有多美！an exquisitely charm...
He once again raised his baton and brought in the brass.他再次举起指挥棒，让铜管乐部加入进来。A loose brass knob on the bedstead rattled.床架上一个松动的球形铜扣发出嘎啦声。How did she have the brass to ask for more?她怎么有脸开口再要呢? She was clanging the brass be...
看得出科恩并不明白米勒德想说什么。It was clear Cohen didn't understand what Millard was driving at.有大量疾病是由不明环境因素造成的。A surprising number of ailments are caused by unsuspected environmental factors.该作家的风格表明其道德观有点暧昧不明。The author's...
请你邮寄这个小包裹算是利用你 吗 ?Would it be an imposition to ask you to mail this parcel?请你替我把这个小包裹捆一下好 吗 ?Will you do up this parcel for me?几个青年妇女把掉在水里又捞出来的小包裹,丢给了他们.The women rescued their bundles which had fallen into the water and...
He was soon one of the most celebrated young painters in England.不久他就成了英格兰最负盛名的年轻画家之一。He and Helen celebrated their silver wedding last year.他和海伦去年庆祝了他们的银婚。Their lives interconnect with those of celebrated figures of the...