These three main categories of epidemiological study may each require, as a preliminary phase, a fourth and rather different approach-that is, a method study . 流行病学调查研究的这三个主要种类，每种都需要第四种不同的途径--即方法研究做为其前期阶段。
The result would be an overwhelming soviet capacity to destroy our icbm force, not offset by any american buildup in other categories of strategic weapons . 其结果必将使苏联拥有不可抵挡的能力来摧毁我们的洲际弹道导弹力量，美国无论怎样加强其他种类的战略武器都无济于事。
Dialog box , select the job category to delete 对话框中，选择要删除的作业类别。
Sorting , though - that s in the " hard " category 但是排序却属于“困难”这一类。
Category : reaction - wash the hand name : automatic hand dryer 产品名称：自动干手器
