名词
中文翻译：顶层
同义词：
['top layer', 'upper stratum']
例句：
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1.The top stratum of the soil is rich in nutrients.
土壤的最上层富含养分。
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2. The researchers found that the top stratum of the ocean was changing rapidly.
研究人员发现海洋的最上层正在迅速变化。
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3. The top stratum of the city is where most of the business and government activities take place.
城市的最上层是大多数商业和政府活动发生的地方。