几乎在所有的情况(最显著的例外是string)下，一个应用到字典的列表函数的行为就像该函数收到了该字典的一个值列表。
In almost every case (the notable exception being string ), a list function applied to a dictionary behaves as if the function had been passed a list of the values of the dictionary.
那些诸如空调与微波炉标注为必需品的东西所占的份额很低(即使最高值也不例外)，这很有意思。
It's interesting that the share of those labeling things like air conditioning and microwaves as necessities is (and was at the peak) so low.
可选参数是一个例外，因为它们是可选的。对于可选参数，如果绑定不能通过URI获取它的值，是没关系的。
Optional parameters are an exception, because they are optional. For an optional parameter, it's OK if the binding can't get the value from the URI.
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