There's an obvious gap between the coastal area and inland, the eastern and western China.

我国沿海与内地，东部地区与西部地区明显地存在着差距。

youdao

There was an obvious gap between academic authors and industry practitioners in using mathematical methods.

学术部门和实务部门的作者在运用数理方法上存在着差异。

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There is an obvious gap about the energy intensity of China's iron and steel with the world's advanced level.

我国钢铁能源强度与世界先进水平相比存在明显差距。

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Though jazz fans are always prone to deplore the omission of personal favourites, the most obvious gap in Mr O'Meally's assortment is not his fault: Ray Charles's managers apparently refused permission for his work to be included.

ECONOMIST: Jazz singers

There is also an obvious generational gap in energy levels: whereas 70% of the grandparents were over 50 years old, the study found, 70% of the children were 11 or younger.

ECONOMIST: Grandparents raising grandchildren

For rower Zhang, that gap is painfully obvious.

NPR: China Looks To Row Away With Most Gold Medals