遇到一个长句,其中that在句中承担什么成分,起到什么作用,是否指代什么,搞不清楚,Those who watched TV for less than 7 hours a day were also 50 percent more likely to develop memory loss than those who spent longer than that

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遇到一个长句,其中that在句中承担什么成分,起到什么作用,是否指代什么,搞不清楚,Those who watched TV for less than 7 hours a day were also 50 percent more likely to develop memory loss than those who spent longer than that
遇到一个长句,其中that在句中承担什么成分,起到什么作用,是否指代什么,搞不清楚,
Those who watched TV for less than 7 hours a day were also 50 percent more likely to develop memory loss than those who spent longer than that staring at the screen.请问句中that如何理解?

遇到一个长句,其中that在句中承担什么成分,起到什么作用,是否指代什么,搞不清楚,Those who watched TV for less than 7 hours a day were also 50 percent more likely to develop memory loss than those who spent longer than that
that是代词,指的是7 hours a day.
这里比较的两方是：Those who watched TV for less than 7 hours a day,those who spent longer than that.每天看电视少于7小时的人,和花时间比它（每天7小时）多的人.

Those who watched TV for less than 7 hours a day were also 50 percent more likely to develop memory loss than those who spent longer than that staring at the screen：那些看电视每天少于7小时百分之50也更有可能发展比那些花比盯着屏幕长记...

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Those who watched TV for less than 7 hours a day were also 50 percent more likely to develop memory loss than those who spent longer than that staring at the screen：那些看电视每天少于7小时百分之50也更有可能发展比那些花比盯着屏幕长记忆丧失。that和staring连接是记忆丧失的意思，所以that可理解为记忆。
谢谢，望采纳！

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