It is clear, then, that rhetoric is not bound up with a single definite class of subjects, but is as universal as dialectic; it is clear, also, that it is useful.
这样就清楚了，修辞学是没有确定的事物对象的，这一点有点像辩证法，而且很很有用。
Going very deep into one subject, learning and understanding it over a course of several years, ACTS as a point of reference that is useful when we learn other subjects.
对于某个主题，要非常深入的钻研，并用数年时间学习和理解，这样才能将其用来作为学习其他技能时的参照。
In order to obtain the sensitivity and the specificity, which are useful for practice, it is necessary that a subsample should be selected in the screened negative subjects for diagnoses.
为了获得有实用价值的灵敏度及特异度，在筛查阴性者中抽取一定比例样本进行诊断试验是必要的。
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