They must be initiated by some explicit user interaction (normally, by clicking an action link in a portlet), and they cannot be used to set up a coordinated view when first jumping to a page.
它们必须由某个显式的用户交互（通常是通过单击 Portlet 中的某个操作链接）发起，并且不能在第一次跳转到某个页面时将它们用于设置协作视图。
Among first-time travelers, solo travel is even more popular, jumping to 37 percent, up from 16 percent in 2013.
在首次出游的旅行者当中，单人旅行的风气甚至更盛，从2013年时的16%跃升至37%。
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