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本期内容：
Facebook unveiled an upgraded “Like” button for responding to posts on its social network, adding options for “love”, “haha” ,“yay”, “wow”, “sad” and “angry”, each with its own icon. This will give the company more data with which to personalise its users' news feeds.
词义解析:
Unveil: 推出
Upgrade：升级
Options：选择
Icon：图标
News feeds: 新闻推送
