注意，“DONE” 消息被通过数据流从每个后台线程发送到结果侦听程序。

Notice the "DONE" message being sent from each background thread through the stream to the results listener.

youdao

另外，还提供一些类来在系统上创建新的后台打印文件，生成scs打印机数据流。

Additionally, classes are provided to create new spooled files on the system, and to generate SCS printer data streams.

youdao

读取器/写入器有性能开销，因为它们旨在用于字符流，且会在后台将数据编码为字节。

There is a performance overhead involved with readers/writers because they are intended for character streams, and they encode data to bytes under the covers.

youdao