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...
磁带成本高，而且每录制一次音质就会变差一些。Tape is expensive and loses sound quality every time it is copied.她的视力因年岁的增长而变差了.Her eyesight grew dim with age.房子不会因为几块烂木板就变差.A house isn't in poor condition because of a few rotten boards....
Conclusion: AbE is potentially a biological response modulator for hemopoietic and immuno - regulstion.结论: AbE有可能成为一种能改善造血与免疫功能的生物反应调节剂.METHODS: The culture of hemopoietic progenitor cell in vitro was used.方法: 采用造血祖细胞体外培...
How can I determine a dachshund has the sable pattern?我该如何确定这一只腊肠是否有黑毛尾花色?Accidentally , my Dachshund Basset Hound gave birth to a mongrel.前腿向内弯曲, 通常发生在一些短腿的犬种如巴塞特猎犬.Rolling on earthworms or dead bugs, for example, is a ...
It was made from the typical native material , buckskin, right down to the moccasins.衣服与莫卡辛软帮鞋是用典型的本地鹿皮制作的.The buckskin , finding no feed to her taste, took the trail stablewards, the bridle dragging.那匹黄骠马找不到合意的东西吃, 就顺着小...