做功课。要为新家买新电视机，要多大才是最好的选择呢？
参考如下：
From "HowStuffWorks":
Once you've placed the TV, measure the distance from your couch or viewing area. There is a formula to calculate the optimum screen size based on the viewing distance. Different TV sources alter the equation. The formula is simple:
| Source | |
| Cable Antenna Video tape | Multiply the number of feet between you and the screen by 4 inches. |
| DVD Satellite | Multiply the number of feet between you and the screen by 6 inches. |
| HDTV | Multiply the number of feet between you and the screen by 7 inches. |
Of course, very few of us watch only one kind of TV. Use the chart above as a guide to find an average distance and screen size that is appropriate for your needs.
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