Yet,every day,Americans depend on their transportation system to keep them, and the largest economy in the world, on the move.

VOA: special.2010.01.11

Just swapping them, right? I temporarily hold on to what's in the i'th element so I can move the i plus first one in, and then replace that with the i'th element.

交换他们，对么？,临时的保存下第i个元素,然后把第i+1个元素移进来，把i+1的位置替换为第i个元素。

麻省理工公开课 - 计算机科学及编程导论课程节选