It depends on predefined symbol and type definitions and is not easily modified or extended.

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。

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On a UNIX-based operating system, this is most easily accomplished by using the STDIN redirection character that is appropriate for your shell, such as the less-than symbol (<) for the Bash shell.

在基于 UNIX 的操作系统中，通过使用适合您的 shell 的 STDIN 重定向字符最容易实现了，比如为 Bash shell 使用小于号 (<)。

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China could far more easily launch its jets from shore. But it would be widely seen as a potent symbol of China's rise as a military power.

中国的喷气式战机已能轻易从海岸升空，但这被广泛看作同中国崛起一样，是军事实力强大的象征。

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