Assume that you are lucky, and whenever you arrive at a subway station, a train is there that you can board immediately.
假设你很幸运，每当你到地铁站时，你总能立即乘坐地铁。
Foursquare is a very cool application, and unlike other location-aware apps, it adds a competitive element to the interaction, as it rewards you for checking in whenever you arrive at a new location.
Fours quare是款很酷的应用，不像其他一些能感知地理位置信息的应用，它增添了相互竞争的互动元素，每当你到一个新地方然后登陆的话，系统就会奖励你。
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