上层的英文：
upper layer

参考例句：

A pose cultivated By the upper classes
上层阶级所培养的风度

The elites are by their nature a factor contributing to underdevelopment.
这些上层人物天生是助长欠发达的因素。

The snags incidental to a changeover in upper management.
在改变上层管理时产生的隐患

Men of the upper class are usually sterile and dehumanized.
上层阶级的男人通常是萎靡不振,缺乏人性本能力量的。

The salt water, being more dense, flows upstream under the fresh water which is flowing downstream
淡水在上层向下流动，比重更大的盐水在下层逆流向上。

The upper storey
上层楼面

He is skilled in upstairs politics.
他精通上层政治。

The privileges of the elite
上层人物的特权

Placed higher up;upper
位于较高处的;上层的

A double-deck bus has 2 levels: you can smoke on the upper deck.
双层公共汽车的上层可以抽烟。

upper是什么意思：
adj. （地位）较高的；上面的，上部的
n. 鞋帮；兴奋剂

His upper arms are strong.
他的上臂很强壮。

having a flat or flattened upper surface.
有平的上表面或使上表面变平的。

I live in the upper reaches of the river.
我住在河的上游地区。

bush for rear bearing upper half
后轴承上半部轴衬

The snags incidental to a changeover in upper management.
在改变上层管理时产生的隐患

layer是什么意思：
n. 层；产卵鸡；卵用鸡；层次；阶层；地层
v. 分层放置，形成层次；用压条法培植

This hen is a good layer.
这只母鸡下蛋多。

BL ( Bridge-Layer)
架桥装置

Onions have layers, you get it?
洋葱是有层次的，你明白了吗？

These layers are called strata.
这些岩层被称作地层。

A layer or series of layers of sediment deposited in a body of still water in one year.
纹泥，季候泥一年中沉积在寂静水中的一层或几层沉淀物