A set of operations that are to be performed sequentially , each of which(except the first) uses the output of the previous operation as input.
A set of operations that are to be performed sequentially , each of which(except the first) uses the output of the previous operation as input.
一组要依次执行的操作，除第一个外，每个操作均使用前一个操作的输出作为输入。