分三组进行试验，以第二组作为对照标准。
The tests were given to three groups, group Two being used as a control.
我们分三组干活。
我有十五个实习生和学生，他们共分三组，我给每个学生都讲了我的教学目的和走廊里塑料人体躯干的优越性。
I've got 15 interns and students in groups of three, each student having been lectured about my pedagogical purpose and my superiority to the plastic torso down the hall.
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