它依赖于预定义的符号和类型定义，并且不容易进行修改或扩展。
It depends on predefined symbol and type definitions and is not easily modified or extended.
Expect的扩展正则表达式功能非常强大，并且很容易通过代码确定格式。
Expect boasts extensive regular expression capabilities, and the formatting is easy to code.
扩展这些代码行很容易，并且可以根据需要使用它们，只需导入正确的库即可。
Extension along these lines could be written easily and used as needed, simply by importing the correct library.
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