If the user attempts to TAB past a mandatory input item, an error message appears.
如果用户想跳过必填的输入项，则会出现一条错误消息。
For: Iterates through an input sequence, binding a variable to each input item in turn.
for：对输入序列进行迭代，依次将一个变量绑定到每个输入项。
The only real difference from Listing 4 is that Listing 5, instead of asking for recommendations, asks for the most similar items to the input item.
它与清单4之间的唯一差异就是，清单5并没有请求推荐，而是请求输出最相似的项目。
Gets the staging area input item being processed by the input manager.
获取输入管理器处理的临时区域输入项。
Gets the staging area input item being processed by the input manager.
获取输入管理器处理的临时区域输入项。
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