It was an enormous task that affected every stratum of society. [+ of]
这是一项影响到社会各阶层的重大工作。
The rebels came overwhelmingly from the poorest strata of rural society.
叛乱分子绝大多数来自农村的最贫困阶层。
Contained within the rock strata is evidence that the region was intensely dry 15,000 years ago.
岩层中有证据表明,该地区在 15,000 年前曾经非常干旱。
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