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The outermost layer or covering of something, often referring to the external part of an object, structure, or system.
地球的外层大气层保护着地球免受太阳辐射的伤害。
Earth's outer atmospheric layer protects the planet from harmful solar radiation.
Commonly used in scientific, technical, and everyday contexts to describe the external part of an object or system.
In scientific contexts, '外层' often refers to the outermost part of a system, such as the outer atmosphere or outer layer of a material.
Composed of '外' (wài, meaning 'outer' or 'external') and '层' (céng, meaning 'layer').
Often used in scientific, engineering, and architectural contexts to describe the outermost part of an object or system.