演示如何实现简单安全性插件的示例？
Examples that demonstrate how to implement simple security plug-ins.
这些飞机之所以很受欢迎是因为他们设备简单而安全性又高，并且相对便宜。
These helicopters got their popularity first of all due to their simple devices and high safety.
这些飞机之所以很受欢迎是因为他们设备简单而安全性又高，并且相对便宜。
These helicopters got their popularity first of all due to their simple devices and high safety. And because of a relatively low price.
应用推荐