For more than a decade, the web created an alternative space that threatened television's grip on society.
2
史密斯先生谈到，随着美国人花费更多的时间在线，网络社交总体上升并开始替代个人在物理空间的活动。
As Americans spend more of their time online, social networking technology as a whole is growing and starting to replace activities individuals once performed in physical Spaces, Mr Smith said.
3
尽管LED灯比白炽灯利润空间更大，但灯源替代市场钟会趋于缩小。
Although LEDs will be more profitable than incandescent bulbs the replacement market will eventually dwindle.
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