• 1. The First Pair: 首对
• 2. the first pair of skates: 第一双滑冰鞋

• 1.After the first pair of tasks was completed, one group of participants was assigned an undemanding activity intended to cause their minds to wander.
  在第一对任务完成后，一组参与者被分配了一个要求不高的活动，目的是让他们走神。
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• 2.Describe the first pair of sunglasses you ever bought.
  我买的第一副墨镜。
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• 3.The first pair is different versions of the append() method.
  第一对是另一版本的 append() 方法。
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