这些类可以分为三个MIME类型子集：面向字节的、面向字符的和面向服务的。

These classes can be broken up into three subsets of MIME types: byte-oriented, character-oriented, and service-oriented. The byte-oriented flavors are.

youdao

从数据传输可靠性上和传输效率上，较以往的异步方式及面向字节的同步通信方式有了较大提高。

By the look of the dependability and efficiency of data transmission, it have improved a lot more than the past asynchronous way and byte-oriented synchronous communication way.

youdao

首先，它可以从面向字节的代码集编码单字节字符，其次，当在数组中使用时，它可以从多字节字符集(如unicode)，编码任何多字节字符。

First, it can encode a single byte character from any byte-oriented code set, and second, when used in an array, it can encode any multi-byte character from a multi-byte character set such as Unicode.

youdao