当然，如果真的担心这一点，也很容易在构造发送到Twitter的URL之前，从头至尾检查重复参数列表，并采用指定的每种参数的最后一个参数。
Of course, if it becomes a concern, it's not hard to walk through the list of repeated parameters and take the last one of each kind specified before constructing the URL sent to Twitter.
此外，交互活动还能在诸如循环和选择这样的复杂控制的构造中提供操作数(例如，某个给定的交互活动可能需要重复某个具体的次数)。
Furthermore, interactions can serve as operands in complex control constructs such as loops (for example, a given interaction may have to be repeated some number of times) and alternatives.
可以重复执行这种操作以构造整个列表，参见清单23。
You can repeat this for the entire list as shown in Listing 23.
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