outside

Compared meaning: located on or coming from the outer part (adjective).

比较义项：外部的，来自或位于某物之外（形容词）。

• external

  Formal or technical register; describes something connected to or originating from an outer source, often contrasted with an internal counterpart, and typically modifies abstract or technical nouns like factors, drives or agencies.

  较正式、书面化；描述与某物相连或源自其外部的事物，常与“内部”相对，多用来修饰抽象或技术性名词，如factors（因素）、drives（驱动器）或agencies（机构）。

  External factors such as weather can affect the company's sales results.

  天气等外部因素会影响公司的销售业绩。

• outside 本词

  Everyday and concrete; describes something on the outer surface of a building or enclosed space, without necessarily implying a contrasting internal system, and is common in casual physical descriptions.

  更口语、具体；描述建筑物或封闭空间外表面的事物，不一定暗示与之相对的内部系统，常用于日常的具体描述。

  The outside wall of the house was painted a bright blue color.

  房子的外墙被漆成了鲜艳的蓝色。

External and outside both mean 'outer', but differ. External is more formal and abstract, common in technical or business contexts. Outside is more everyday and concrete, describing the outer surface of a building or enclosed space. Outside as an adverb is not compared here.

这两个词都表示“外部的”，但external更正式、抽象，常用于技术或商务语境（如external factors，external hard drive），强调与“内部”相对的关系；outside更口语、具体，常用于描述建筑物或封闭空间的外表面（如outside wall）。这里不比较outside作副词或名词的用法（如“playing outside”表示“在外面玩”）。

Compared meaning: the outer surface of something (noun).

比较义项：物体的外部、外表（名词）。

• outside 本词

  The everyday, informal word for the outer part of almost anything; often used with prepositions like 'on the outside' or as an adverb meaning 'outdoors'.

  outside 是日常口语中最常用的词，几乎可以指任何事物的外部；常与介词连用，如 on the outside，也常作副词表示“在户外”。

  The children love playing outside in the garden.

  孩子们喜欢在花园里到户外玩耍。

• exterior

  A more formal word, typically used for the outer surface of buildings, vehicles or other solid structures, often in technical, architectural or descriptive contexts.

  exterior 是较为正式的词，通常用于建筑物、车辆等实体结构的外表面，常出现在技术性、建筑性或描述性的语境中。

  We painted the exterior of the house a bright blue color.

  我们把房子的外墙漆成了鲜艳的蓝色。

Outside and exterior both mean the outer surface of something, but differ in register. Outside is the everyday, informal word, used for almost anything, as in 'on the outside'. Exterior is more formal, typically used for buildings, vehicles, or other solid structures, in technical contexts.

两词都可以指物体的外部表面，但语域和搭配不同：outside 是日常口语中最常用的说法，几乎什么东西的外部都能用；exterior 更正式，常用于建筑物、车辆等具体实体的外表面，也可以指人的外在表现。