each

Compared meaning: every member of a group, with no exception (adjective).

比较义项：某个群体中的全部成员，强调整体数量或逐一无例外（形容词）。

• all

  All treats the group as one whole; it goes with a plural or uncountable noun and stresses total quantity, not individual members.

  all把整体看作一个集合，后接复数名词或不可数名词，强调总量而非逐个成员。

  All the students passed their final exams this year.

  今年所有学生都通过了期末考试。

• every

  Every takes a singular noun and means each one without exception; it typically describes repeated routines or general rules rather than checking individuals one by one.

  every后接单数名词，表示“每一个，毫无例外”，通常用来描述反复出现的习惯或普遍规律，而不是逐个核对个体。

  She checks her email every morning before breakfast.

  她每天早上吃早饭前都会查看邮件。

• each 本词

  Each also takes a singular noun but focuses on members considered separately, often used for a specific, countable group where individual treatment matters.

  each同样后接单数名词，但强调把每个成员分开看待，常用于人数明确、需要逐一对待的具体群体。

  Each student received a certificate at the ceremony.

  典礼上每位学生都单独领到了一张证书。

All three words mean every member of a group. All treats the group as a whole and takes a plural noun. Every takes a singular noun and means with no exception, often for routines. Each takes a singular noun too, but looks at members individually.

这三个词都能表达“群体中的全部成员”，但侧重点不同：all把整体看作一个集合，强调数量或范围；every强调逐一核查、毫无例外，常用于描述习惯或规律；each则突出把每个成员分开看待，强调个体差异。此处不比较all作副词表示“完全”（如all alone）或each作副词表示“每个，各”（如five dollars each）的用法。

Compared meaning: for each one, individually (adverb).

比较义项：每个，各自（副词）。

• each 本词

  A common, neutral word for distributing to every individual one; it can stand before a noun or pronoun and appear in many sentence positions, so it fits almost any everyday context.

  each 是表示“每一个”的常见中性词，可以直接放在名词或代词前面，也能出现在句子的多个位置，几乎适用于任何日常语境。

  Each student received a certificate at the ceremony.

  每位学生在典礼上都收到了一张证书。

• apiece

  An adverb used only after a quantity or price, showing how much each item or person gets or costs; it sounds more formal or written, common in shopping, tickets and sports scores.

  apiece 是副词，只能用在数量或价格之后，表示每件物品或每人所得、所值的量；语气更正式、更偏书面，常见于购物、票价和比分等场合。

  The tickets cost twenty dollars apiece for the concert.

  这场音乐会的门票每张二十美元。

Both words mean for each individual one. Each is common and flexible, and can go before a noun or pronoun in many positions. Apiece is more formal, used only after a quantity or price, as in written or business contexts like shopping and sports scores.

这两个词都表示“每一个”，但用法和语域不同：each 使用更自由、更口语化，常直接修饰名词或代词；apiece 只能放在数量、价格等词语之后作副词，语气更正式，常见于书面或商业语境。