一半参与者握紧了拳头，另一半则没有握拳。
这样，高脂饮食组的一半大鼠开始运动，另一半则没有运动。
So, some of the rats on the high-fat diet were now exercising. Some were not.
他们中有一半既人参与锻炼计划至少长达六个月，另一半既人则没有参加。
Half of them had been part of an exercise programme that lasted six months, while the other half had not.
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