The example code for adding a menu item refers to an object of type "LLSD".
添加菜单项的样例代码引用了一个 “LLSD”类型的对象。
When explicit type information for variables is written in the code, these type annotations follow the colon after the item name (i.e., Pascal-like syntax).
当在代码里显式地为变量指定类型信息时，类型注解应该跟在变量名的冒号后面(也就是类pascal语法)。
You would have to code a different function for each type of item you wanted to swap.
对于每种需要交换的类型来说，都需要定义一个不同的函数。
You would have to code a different function for each type of item you wanted to swap.
对于每种需要交换的类型来说，都需要定义一个不同的函数。
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