美国维珍平均每天都在Twitter上收到超过350个直接留言，而客人习惯于在空中通过Facebook评论空中服务以及航班延误情况。
The airline receives more than 350 direct messages on Twitter on an average day, and customers regularly comment on service and delays on Facebook during a flight.
在大多数北美人的家里，如果你是客人，而主人又不吸烟，你就不应该在他们家里吸烟。
In most North American homes, if you are a guest, and the hosts are not smokers, you should not smoke in their house.
这一地区由于游客人数太多而面临威胁。
The area is under threat from the sheer number of tourists using it.
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