在英文中，不能长久看电视可以用一些不同的表达方式来表示。下面是几种可能的表达方式，以及它们的中文翻译和一些例句：
Can't watch TV for long periods of time: 不能长时间看电视
Example: "I can't watch TV for long periods of time because it gives me a headache." (我不能长时间看电视，因为它会让我头痛。)
Have trouble sitting still for long periods of time: 长时间坐着有困难
Example: "I have trouble sitting still for long periods of time, so I have to get up and move around every once in a while." (我长时间坐着有困难，所以我必须偶尔站起来活动一下。)
Get restless after watching TV for a while: 看电视一段时间后会变得焦躁不安
Example: "I get restless after watching TV for a while, so I usually take breaks and do something else in between shows." (我看电视一段时间后会变得焦躁不安，所以我通常会在节目之间休息一下做点别的事情。)
希望这些信息能帮到你！