电视对孩子有即时效用。
Television has an immediate impact on your child's behavior.
多数等离子和液晶电视当你正面观看时效果很好，但是当你移动到一旁就可能褪色，液晶显示器来说尤其是这样。
Most plasma and LCD sets look great when you're watching straight on, but the picture may become washed-out as you move to the side, especially with LCD displays.
本文结合传播学与经济学相关理论，从时长、时序、时效、时机、时段五大要素来研究电视节目。
This article USES the theory of communication and economics to study TV programs from time length, time sequence, time utility, time opportunity and time period.
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