residual

Compared meaning: the part that is left over (noun).

比较义项：剩余的部分或余量（名词）。

• rest

  The most common, everyday word for what is left; neutral in tone, used for a remainder of any size, often with 'of' (the rest of the pizza).

  最常见、最口语化的“剩余部分”说法，语气中性，可指任意大小的余量，常与 of 连用（the rest of the pizza）。

  She ate half the pizza and saved the rest for breakfast.

  她吃了一半披萨，把剩下的留到早餐吃。

• residue

  A small physical trace left behind after most of a substance is used, removed, or reacted; often implies dirt, stickiness, or something unwanted.

  指某种物质大部分被使用、清除或发生反应后残留下的少量痕迹，常带有脏污、粘腻或令人不悦的意味。

  Wipe off the sticky residue the tape left on the wall.

  把胶带留在墙上的粘性残留物擦掉。

• residual 本词

  A technical noun for a small leftover amount, common in finance, accounting, or statistics; the word is more often used as an adjective (residual value) than as this noun.

  指少量剩余额的专业名词说法，常见于财务、会计或统计语境；该词更常作形容词使用（如 residual value“剩余价值”）。

  The budget report showed a small residual of unspent funds.

  预算报告显示还有一小笔未花完的剩余资金。

• remainder

  A formal word for what is left after part has been used, removed, or subtracted; the standard term for the leftover number in a division.

  指某部分被使用、去除或相减后剩下的部分，语气正式，也是除法运算中“余数”的标准说法。

  Divide 17 by 5 and you will get a remainder of 2.

  17 除以 5，余数是 2。

Rest, residue, residual and remainder all mean what is left. Rest is common and neutral, for any leftover. Residue is a small physical trace, often unwanted. Residual is technical, used in finance, more often an adjective. Remainder is formal: a division's leftover number.

这四个词都表示“剩余的部分”，但语气和场合不同：rest 最口语、最通用；residue 强调物质上残留的少量痕迹，常带负面色彩，如粘腻的残留物；residual 在此指名词“剩余额”，多用于财务、会计、统计等专业语境，它更常见的用法其实是形容词“剩余的”；remainder 语气正式，是数学除法中“余数”的标准说法。这里不比较 rest 表示“休息”的动词义。