帮忙看看下面这段英文关于bash

waterloo2005

The arithmetic expression feature is built into bash's syntax, and was available in the Bourne shell (most versions) only through the external command expr. Thus it is yet another example of a desirable feature provided by an external command being better integrated into the shell. getopts, as we have already seen, is another example of this design trend.

其中Thus it is yet another example of a desirable feature provided by an external command being better integrated into the shell.这句是什么意思？
谢谢

psblunder

Post by waterloo2005;1930102
The arithmetic expression feature is built into bash's syntax, and was available in the Bourne shell (most versions) only through the external command expr. Thus it is yet another example of a desirable feature provided by an external command being better integrated into the shell. getopts, as we have already seen, is another example of this design trend.

其中Thus it is yet another example of a desirable feature provided by an external command being better integrated into the shell.这句是什么意思？
谢谢

仔细翻译一下：
这提供了另外一个外部命令(的特性)被更好的集成到了shell里的例子。

意思可能是这样：有些命令在bash里更好发挥作用，体现一种分而治之的想法。