疾病传播

Assuming that the connect and infectious rate is a periodic function, we study the asymptotic behavior of the solution for this model.

在模型中，假设接触感染率为时间的周期函数，研究模型解的渐近行为，得到了疾病传播的阈值。

It would spread rapidly and come to be known as "The Black Death".

这次疾病传播得更为迅速，被人们称作是"黑死病"。

Todays study estimated the contagiousness of the disease by analysing the number of people travelling to Mexico who became infected, and comparing that with a study of a Mexican village where the disease has spread.

今天的研究通过对在墨西哥旅游而受到感染的人数的分析，再对比墨西哥一个村庄疾病传播的研究，对该病毒的接触传染力进行了估计。

It is the way to prevent disease effectual that use soap to wash hands.

用肥皂洗手是有效防止疾病传播的一种方式。

If you contact with someone else, you will probably promote the spread of diseases, so, wear an exposure suit.

如果你与另一个人有过身体接触，你将可能帮助疾病传播，所以，要穿戴防护。

But if small area and building inside of gearing and management of the design, construction of the water supply system maintenance isn't appropriate, may result in fluid matter drive pollute of phenomenon, cause the disease spread, endanger the people's health and the life directly.

但若小区和建筑内的给水系统设计、施工安装和管理维护不当，就可能造成水质被污染的现象，导致疾病传播，直接危害人民的健康和生命。

"Very frequent hand-washing is something that we talk about time and time again and that is an effective way to reduce transmission of disease," Dr.

"我们反复强调一定要非常频繁的洗手，这对减少疾病传播是非常有效的。"

Washing hors dawn soap is first of the ways to prevent diseases.

用肥皂洗手是有效防止疾病传播的一种方法。

Towns were crowded and insanitary; people were often malnourished; and disease spread fast.

城镇里又脏又挤；人们常常营养不良；疾病传播迅速。

"It covered all of the contemporary issues of public health, from environmental health through infectious disease transmission," said Jerrold M. Michael, a former assistant surgeon general and a former longtime dean of the University of Hawaii School of Public Health, who worked on the report.

" ，它涵盖了所有的当代公共卫生问题，从环境健康传染性疾病传播，说："暗淡无光米迈克尔，一名前助理外科医生将军和一名前资深主任，夏威夷大学公共卫生学院，任职於该报告。

The absorption and distribution of chromium were studied in ryeusing nutrient culture technique and pot experiment.

采用不同浓度K2CrO4(0，0.4，0.8和1.2 mmol/L)的Hoagland营养液处理黑麦幼苗，测定铬在黑麦体内的亚细胞分布、铬化学形态及不同部位的积累。

By analyzing theory foundation of mathematical morphology in the digital image processing, researching morphology arithmetic of the binary Image, discussing two basic forms for the least structure element: dilation and erosion.

通过分析数学形态学在图像中的理论基础，研究二值图像的形态分析算法，探讨最小结构元素的两种基本形态：膨胀和腐蚀；分析了数学形态学复杂算法的基本原理，把数学形态学的部分并行处理理念引入到家实际应用中。