1
the upper layer of [sth]
the upper layer of the Earth
地球的上层
上层
先理解核心含义，再看它在真实句子里的用法。
上层
a layer that is above another; the top or higher stratum
the upper layer of the Earth
地球的上层
The upper layer of the cake was covered with fresh strawberries.
蛋糕的上层铺满了新鲜草莓。
You need to remove the upper layer of paint before applying a new coat.
你需要先去掉油漆的上层，再涂新的一层。
The upper layer of the soil contains most of the nutrients.
土壤的上层含有大部分养分。
the upper layer of the Earth
地球的上层
表示位置
The data is stored in the upper layer.
数据存储在上层。
Not this
The data stored at upper layer is sensitive.
Use this
The data stored at the upper layer is sensitive.
中文常省略冠词，但英语中特指某上层时需要加定冠词 'the'。
Not this
We need to update upper layer settings.
Use this
We need to update the upper layer settings.
同样，'upper layer' 前缺少定冠词 'the'，表示特指的上层设置。
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Dictionary facts from BridgeDict normalized sources.