同意陈老师分析。补充一点上文及参考译文，以助理解：

Yet mastering these arduous skills is at the very essence of achievement. Most people work in groups. We do this because groups are much more efficient at solving problems than individuals (swimmers are often motivated to have their best times as part of relay teams, not in individual events). Moreover, the performance of a group does not correlate well with the average I.Q. of the group or even with the I.Q.’s of the smartest members.

【参考译文】

可是，掌握这些艰难的技能正是取得成就之关键。大部分人是在团队中工作的，我们这么做是因为团队在解决问题方面比个人更有效率（游泳运动员常常在接力赛中由于受到激励而屡出佳绩）。此外，一个团队的表现也和其成员的平均智商、甚至和最聪明的某些成员的智商没有太大关系。