push operation

• 进栈操作,压栈操作

push operation的用法和样例：

例句

1. This algorithm avoids the numerous repeated operations for getting many pixel color values without increasing the number of push and pop operations.
   改进后的算法不增加入栈出栈操作的次数，却免除了原算法中为获取众多象素颜色值所需要的大量重复操作。