弃权和禁反言之间存在密切的联系，同时又有著本质的区别。
There are close relations but also essential difference between the waiver and the estoppel.
这其实和他的伤病没有本质的联系。
品牌的本质永远是产品和用户之间的联系。
Brand has always been about the relationship between product and user.
三者有着本质的区别，但存在着十分紧密的联系。
The three is the different in nature, but meantime is the extremely close relationship.
这两个问题是紧密联系的，但是本质完全不同。
These two problems are tightly coupled, but quite different in nature.
历史研究本质上是发现史实之间的内在联系。
The essence of history study is to discover the inner link among historical facts.
历史研究本质上是发现史实之间的内在联系。
The essence of history study is to discover the inner link among historical facts.
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