短语讲解：
1. But compared to watching traditional TV programs, the 3-D channel requires viewers to have special 3-D TV sets.
compare to与…相比
例句：The writer was compared to Shakespeare.
把这个作家与莎士比亚进行了比较。
2. Besides the set-top box, viewers are supposed to have a 3-D TV set.
be supposed to应该,被期望
例句：Hobbies are supposed to be relaxing.
业余爱好应该是令人放松的。
3. Because of the lack of 3-D TV programs, many TV set manufacturers have developed a 3-D simulation technology that can convert 2-D into 3-D on ordinary television sets.
lack of缺少;不足;没有
例句：He can not buy it because of his lack of money.
他因缺钱买不起这个。
convert into (使)转而变为…
例句：All the bank money was converted into cash.
所有的银行票据都兑换成了现金。
4. Aside from the big screen, the backlight of the 3-D TV set should send light evenly, such as LED.
除…之外aside from
例句：Everything was quiet, aside from the occasional sound of a car in the distance.
除了远处偶尔有汽车的声响外, 四周一片寂静。
