a-layer的意思|示意

Beneath the soil lies a layer of bedrock.

土壤下面有一层基岩。

During the seventeenth and eighteenth centuries, the entire site became covered with a layer of hard grey clay, which minimised further erosion.

在十七世纪和十八世纪，整个遗址被一层坚硬的灰色粘土覆盖，这极大减少了进一步的侵蚀。

As the tree grows, it adds a layer to its trunk taking up chemical elements from the air.

随着树木的生长，它在树干上增加了一层吸收空气中的化学元素而生成的膜。

Behind the front end is a layer of middleware that I call the storage logic.

在前端后面是一个中间件层，我将它称作存储逻辑。

Most data files consist of a single dataset, referred to as a layer.

大多数数据文件都包含一个单独的数据集，通常称为层。

After the wind, there was a layer of dust on the desk.

大风过后，桌上落了一层灰。