We may infer from the passage that the habit of drinking tea in Britain was mostly due to the influence of the upper social class.

我们可以从文章中得知，英国形成的喝茶习惯大多来源于上层社会。

youdao

States had at least three social levels, usually, an upper class of rulers, a middleclass comprised of managers and merchants, and a lower class of crop producers and agricultural laborers.

国家中至少有三种社会阶层，上层阶级（执政），中产阶级（商人，管理者）和下层阶级（农民，工人）。

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As for social class differences, the upper income band and the lower income band practise infidelity in virtually equal Numbers.

社会等级差异方面，高收入阶层和低收入阶层行为不忠的数据实际上差不多。

youdao

But once I started reading the novel it became apparent that Fellowes was writing about much more than the provincial world of upper class Brits clinging to rapidly disappearing social importance.

FORBES: Move up http://i.forbesimg.com t Move down

Only a handful of Indian politicians - mostly the upper class and English-speaking - use social media to communicate.

BBC: Social media and the India exodus

In another time, being "lower-upper class" might actually have freed him to explore a few rungs up the social ladder.

WSJ: The Weekend Interview with Julian Fellowes: The Anti-Snobbery of 'Downton Abbey'