serving

Compared meaning: an amount of food (noun).

比较义项：一份食物的量（名词）。

• portion

  A general word for a part or share of something; it can describe food but also non-food things like money or time, and does not imply a fixed or standard measured amount.

  泛指某事物中的一部分或一份，不仅限于食物，也可以指金钱、时间等，并不强调是固定或标准的分量。

  He ate only a small portion of the large meal.

  他只吃了那顿丰盛大餐中的一小部分。

• serving 本词

  Refers specifically to a single amount of food or drink, especially a standard or recommended amount, often used in recipes, nutrition labels, or when dividing food among people.

  专指食物或饮料的一份，尤指标准或建议的分量，常用于食谱、营养标签，或在人群中分配食物的场合。

  One serving of rice is usually about half a cup.

  一份米饭通常大约是半杯的量。

Portion and serving can mean an amount of food. Portion is a general word for a part of anything, not just food. Serving means one amount of food or drink, often a standard, recommended amount. Portion's other meaning, for non-food things, is not compared here.

这两个词在表示“一份食物”的量时意思相近，但用法有别：portion 是泛指整体中的一部分或一份，不限于食物；serving 专指食物或饮料的一份，尤其是标准或建议的分量。这里不比较 portion 表示非食物的“部分、份额”的用法（如 a portion of the profits）。