The process activities read and write data to and from variables, similar to how it is done in a BPEL activity.

流程活动从变量中读取数据以及向变量中写入数据，类似于在BPEL活动中的操作。

youdao

Overall, the process is simple: Create an appropriate file object, then read or write as necessary.

总体来说，过程很简单：创建合适的file对象，然后按照需要读取和写入。

youdao

Instead, they read the data they should process from system resources, such as the file system or the system kernel, and write results to stdout.

它们是从系统资源(例如文件系统或系统内核)读取需要处理的数据，然后将结果写入到stdout。

youdao