第三群体是对照组，买家被简单的告知只关注他们自己的角色。
The third group was a control; the buyers were told simply to concentrate on their own role.
在13个人口群中，7个被随机分配到1996年至2004年的3轮筛查，而另外6个（对照组）获得的是标准护理。
Of 13 population clusters, seven were randomly allocated to three rounds of screening between 1996 and 2004, while standard care was provided in six (control arm).
结果表明，不同植物类群(禾草类、莎草类)增加降水20%，地上生物量分别比对照提高103。
The results indicated that in the grass group and sedge group, the above ground biomass in the plots, where the precipitation increased by 20%, was 103.
方法用LTSE快速法检测205份水样中的大肠菌群，井同时用法定常规法作对照检测。
Methods The 205 water samples were determined for coliform bacteria by rapid method of LTSE, and at the same time by routine method ruled by National Standard Regulation as control.
菌群分析：采用光冈知足改良法，检测治疗组和对照组治疗前后10种肠道常驻菌；
Analysis of flora: detecting 10 residential bacteria of human beings' intestine through the existing method of our department before and after treatment with BIFICO.
然而目前仍缺乏足够证据支持使用中草药来治疗经前症候群，在下最后的结论前，我们需要更多良好的对照试验。
However, currently there is insufficient evidence to support the use of Chinese herbal medicine for PMS and further, well-controlled trials are needed before any final conclusions can be drawn.
方法：选择腹泻组（39例轮状病毒肠炎患儿）和对照组（30例健康婴幼儿），对他们的肠道菌群进行定量测定。
Methods: The quantitative measurement was used for the intestinal flora in 39 infants with rotavirus enteritis diarrhea (compared with 30 healthy infants).
方法：选择腹泻组（39例轮状病毒肠炎患儿）和对照组（30例健康婴幼儿），对他们的肠道菌群进行定量测定。
Methods: The quantitative measurement was used for the intestinal flora in 39 infants with rotavirus enteritis diarrhea (compared with 30 healthy infants).
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