There are also other varieties that do not live in groups at all.
还有其他种类的蜂根本不是生活在一起的。
They work in small groups, but she says they are not grouped by ability.
他们以小组为单位工作，但她说，他们不是以能力的差异而分组的。
成群出去，不单独处。
But educational groups just appeared in China, effective theories are not enough.
但教育集团在我国还刚刚起步，理论准备不足。
Performance improvements were found in the biofeedback groups but not in the control group.
反馈组出现了表演上的进步，而控制组却没有变化。
Performance improvements were found in the biofeedback groups but not in the control group.
反馈组出现了表演上的进步，而控制组却没有变化。
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