common

Compared meaning: ordinary, not special or outstanding (adjective).

比较义项：普通、一般、不特别、不出众（形容词）。

• average

  Average describes something at the typical middle level, often implying it is unremarkable or mediocre rather than especially good or bad.

  average强调处于典型的中等水平，常暗示平平无奇、并不出众，而不评判绝对的好坏。

  Her cooking skills are average — not bad, but nothing impressive either.

  她的厨艺很一般——不差，但也没什么出彩之处。

• common 本词

  Common emphasizes that something happens often or is widely shared among people, without saying anything about its quality or level.

  common强调某事经常发生或被许多人共同经历，并不评价其水平高低。

  Traffic jams are common in this city during rush hour.

  在这座城市，高峰期堵车很常见。

• standard

  Standard describes something that matches the usual, basic version or specification, often contrasted with a premium or deluxe option.

  standard指符合通常的、基本的规格或版本，常与高级／豪华选项相对。

  We booked the standard room, not the deluxe suite with a sea view.

  我们订的是标准间，不是带海景的豪华套房。

Average, common, and standard can all mean ordinary, not special. Average describes something at a typical level, suggesting it is mediocre. Common means something happens often or is widely shared. Standard means matching the usual, basic version, unlike a premium option. Other senses aren't compared.

这三个词都可以表示“普通、一般、不特别”，但语气和用法不同：average强调处于平均、典型的水平，常带有“平平无奇”的意味；common强调普遍存在、经常发生；standard强调符合基本规格或标准配置，常与高级／豪华选项相对。这里不比较common表示“共同的、公共的”的义项（如a common language），也不比较standard作名词表示“标准、水平”的用法（如a high standard of service），也不比较average表示数学平均值的用法（如the average score）。

Compared meaning: shared by a group of people (adjective).

比较义项：公共的，供一群人共有、共用的（形容词）。

• public

  Public is the broadest term: it describes things provided for, run by, or open to society as a whole, often through the government, and contrasts with private.

  public是三者中含义最宽泛的词：指由政府提供、面向整个社会、任何人都可以使用的事物，与“私人的”相对。

  The new park is open to the public every weekend.

  这座新公园每个周末都向公众开放。

• common 本词

  Common describes something jointly shared or owned by a group rather than by one person, without the government or whole-society implication of public; it often modifies land, property or abstract things like ground or interest.

  common强调由一群人共同拥有或分享，而不像public那样带有“由政府提供、面向全社会”的含义，常用来修饰土地、财产，或像共同立场这样的抽象事物。

  Despite their differences, the two sides found some common ground on this issue.

  尽管存在分歧，双方在这个问题上还是找到了一些共同点。

• communal

  Communal specifically describes things shared by the members of a particular community or household rather than owned privately by each individual, and is common in the context of shared living spaces.

  communal特指由某个特定群体或同住的人共同使用，而不是各自私人拥有，常用于描述公寓、宿舍等共同生活空间中的共用设施。

  The apartment building has a communal garden for all residents.

  这栋公寓楼有一个供全体住户共用的花园。

Public, common and communal all mean shared, not private. Public describes things open to society as a whole, often by government. Common describes something jointly owned by a group. Communal describes things shared by members of one community, like housing. Common meaning 'frequent', not compared.

这三个词都可表示“公共的、共有的”，但侧重不同：public强调面向整个社会、常由政府提供；common强调由一群人共同拥有或分享，不一定涉及全社会；communal则强调由某个特定群体（如同住的人）共同使用，而非私人拥有。这里不比较common的“常见的”（发生频率高）这一义项。