Each line of the program contains a single instruction. It could bewritten in English like this.
程序的每一行都是一条单独的指令。
Using modular construction, the program contains a set of optional menus and can be used flexibly and conveniently.
程序结构采用积木块式,结合菜单选择,使用方便灵活。
The program contains a null pointer dereference.
程序包含一个空指针引用。
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