求解释及语法分析：But isn't the packaging essentially they're ought t

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求解释及语法分析：But isn't the packaging essentially they're ought to sell more powder?
这是星火英语6级听力题源720题的一个长对话.根据原文,可以猜测出大概意思是：洗衣粉外包装上的使用说明（多少衣服用多少量）不是商家为了卖出更多洗衣粉而写的吗?为什么还要看呢?
但是不太明白其中词语的用法、和语法成分是怎样划分的,

the packaging 主语,isn't 系动词谓语,essentially 副词状语,they're ought to sell more powder 从句表语.
再问：那么 are ought to do 是什么意思用法呢?
再答：理应........（干什么，怎么样）

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