ExpanderView是一个基础列表项控件，可以用来展开和收起列表项(就像邮件应用里的帖子视图)。
ExpanderView is a primitive items control that can be used for expanding and collapsing items (like the threaded views in the Mail app).
查询参数用来启用或禁用与查询相关的功能，比如拼写纠正、同义词展开等等。
The query parameters are used to enable or disable query related functions such as the spell corrector, the synonyms expansion, and so on.
LinkedIn和Jigsaw可以用来寻找记者联系方式，并展开交谈。
LinkedIn and Jigsaw can be used to find reporter contact info and start conversations.
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