regular

Compared meaning: the normal, non-special version of something (adjective).

比较义项：标准的，普通常备、非特别定制的（形容词）。

• standard

  The neutral, all-purpose word for the normal or default version of something, with no special connotation; used for sizes, procedures, equipment.

  中性、通用度最高的词，指某物“普通、默认”的版本，没有特殊含义；常用于尺寸、流程、设备等场合。

  This model comes with standard features; extras cost more.

  这款车型配备标准配置；额外功能需要加钱购买。

• stock

  Implies something mass-produced or routinely kept ready-made, often with a slightly negative sense of unoriginal or overused, as in a stock answer.

  强调某物是批量生产或现成常备的，常带一点“老套、缺乏新意”的负面意味，例如stock answer（套话）。

  The customer service rep gave the same stock answer to every complaint.

  客服人员对每一个投诉都给出同样的套话式回答。

• regular 本词

  Common in everyday contexts like food or drink sizes to mean the normal, non-special option, as opposed to large or deluxe.

  常用于食品、饮品、服装尺码等日常场景，指“普通、非特殊”的选项，与“大份”或“豪华版”相对。

  I always order a regular coffee, not the large size.

  我总是点普通杯的咖啡，不要大杯的。

Standard, stock, and regular can describe the normal, non-special version of something. Standard is the neutral, all-purpose word, used for sizes or equipment. Stock implies something mass-produced, with a negative, unoriginal sense. Regular is common for food or drink sizes. Other senses are not compared.

这三个词都能形容某物是“普通、标准”的版本，但语气和搭配不同：standard最中性、适用范围最广；stock强调“现成、批量提供”，有时带“老套、缺乏新意”的贬义；regular多用于食品、饮品、服装尺码等日常场景。这里不比较standard表示“水平、质量”的名词用法（如high standard of service），也不比较regular表示“有规律地、定期地”的用法（如take a regular walk）。