这项功能在星期三晚上揭开面纱，至少年内能让美国和加拿大用户拨打免费电话。
The service, unveiled on Wednesday night, will let users make free calls at least to the end of this year within the US and Canada.
而在周五晚上，网站的联想词搜索功能就已经失效了。
On Friday evening, the associative-word feature of the Web site appeared to have been disabled.
Abelson解释道，可以通过按屏幕上的按钮来开启这一功能，以备某个周末晚上他想让朋友们知道他在哪里。
An onscreen button would turn on the program, Mr. Abelson explained, for perhaps a few hours on a Saturday night when the person wanted his friends to know where he was.
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