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汉语拼音：yuán dì

地球表面上发生具有该地区特点的，有均一的温度和湿度条件的大块气团的一个广大地区。

• Conclusion Diphacine na-salt was one of the best anticoagulant rodenticide against commensal rodent in Guangxi plague area.

  结论敌鼠钠盐仍值得在广西家鼠鼠疫疫源地中继续应用。

• Already more than a year the company digital foci sells digital photo- image moments 8.

  已经一年多，该公司的数字疫源地销售的数码照片图像矩8。

• And the outside world tends to be viewed as a source of trouble.

  而且外来世界往往被视为麻烦的源地。

• Another focus of transmission would be a disturbing development for outbreak control.

  另一个传播疫源地将是对暴发控制的一个令人不安的发展情况。

• Objective: To evaluate effects of preventive measures to tsutsugamushi disease in an epidemic focus, Hebei province.

  目的：评价河北省某恙虫病自然疫源地预防措施效果。

• The focus should be put under close surveillance, and its risk to human beings has to be determined.

  对该疫源地仍须密切监视，以确定其对人类的威胁。

• Today the distribution of plague coincides with the geographical distribution of its natural foci.

  今天，鼠疫的分布与其自然疫源地的地理分布相一致。

• Marmot plague foci in the mode of transmission of human plague have direct contact and insect vector transmission in two ways.

  旱獭鼠疫疫源地中人间鼠疫的传染途径有直接接触和媒介昆虫传播两种途径。

• It was found that the frequencies, the intensities and the distributions of TC exist an obvious toward-warming uptrend.

  研究发现：TC源地、发生频数以及强度的时空分布和变化均具有趋暖性。