zhangyifan a50dd219cf fix document error, "is" should be "are". ... Change-Id: Ie7afc0a8450d988b801c84764c4b84eac0670578		2018-05-02 21:45:50 +08:00
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source	fix document error, "is" should be "are".	2018-05-02 21:45:50 +08:00