determine

Compared meaning: to decide something firmly (verb).

比较义项：确定（动词）。

• set

  The neutral, everyday choice for announcing or arranging a specific value — a date, price, rule, or record — without implying investigation or special formality.

  三者中最中性、最常用的词，指宣布或安排一个具体的数值、日期、规则或纪录，通常比较随意，不涉及调查或特别正式的场合。

  The company set new safety standards for all its factories.

  这家公司为旗下所有工厂制定了新的安全标准。

• determine 本词

  Implies deciding something firmly as the result of investigation, evidence, or acting as the deciding factor itself, rather than simply announcing a choice; more formal, used with abstract outcomes.

  强调经过调查、证据或作为决定性因素而确定下来，而不是简单地宣布选择；语气更正式，常用于抽象的结果。

  Scientists determined the exact cause of the plane crash after years of investigation.

  经过多年调查，科学家们确定了这起空难的确切原因。

• fix

  Similar to set but more formal, often British, used especially for settling a specific date, price, or appointment through agreement or arrangement between people.

  与 set 相近但更正式，常见于英式英语，尤指双方通过商定或安排来确定具体的日期、价格或约会。

  We finally fixed a date for the wedding after months of discussion.

  经过几个月的讨论，我们终于确定了婚礼的日期。

Set, determine, and fix all mean to decide something firmly. Set is the neutral, everyday word for announcing a date, price, or rule. Determine implies deciding after investigation, or as the deciding factor itself. Fix is like set but more formal and often British.

这三个词在“确定下来”这个意义上很接近，但语气和使用场合不同：set 最随意、最常用，fix 更正式、偏英式英语，determine 强调经过调查或作为决定性因素而定，语气最正式。这里不比较 set 的“摆放、布置”（如 set the table）和 fix 的“修理”等其他意思。

Compared meaning: to find out a fact or truth (verb).

比较义项：查明，得知某事的真相或事实（动词）。

• determine 本词

  Used when a process, test, or result establishes a fact; the subject is often impersonal (a result, an experiment) rather than a person investigating; more neutral in register than ascertain.

  常用于某个过程、测试或结果查明事实，主体常是非人称的（如结果、实验），而不是人在调查；语域比ascertain更中性。

  The results will determine who wins the competition.

  比赛结果将查明谁赢得比赛。

• learn

  Means to find out passively, often by being told or through experience, without deliberate investigation; common with people, especially children, and everyday facts; more casual than determine or ascertain.

  指被动地得知某事，往往是被告知或通过经历得知，而非经过刻意调查；常用于人，尤其是儿童，以及日常事实；语气比determine和ascertain更随意。

  Children learn new words quickly when they read every day.

  孩子们每天阅读时能很快得知新单词的意思。

• ascertain

  Formal, often used in official, investigative, or written contexts; emphasizes making certain of a fact through deliberate effort or verification; stronger and more precise than learn.

  语气正式，常用于官方、调查或书面语境；强调通过刻意努力或核实来确认某一事实；比learn更强调准确性和确定性。

  The detective needed more time to ascertain who was responsible.

  侦探需要更多时间来查明是谁负责此事。

Determine, learn and ascertain all mean to find out a fact. Determine is used when a process or result establishes a fact. Learn means finding out passively, often by being told, common with people. Ascertain is formal, stressing deliberate investigation to make certain.

这三个词在“查明、得知事实”这一意义上相近，但determine偏重通过过程或结果得出结论，主体常是非人称的（如结果、测试），语域中性；learn较随意，常指被动得知，尤其用于人，尤其是儿童；ascertain最为正式，强调通过调查、核实以确定无疑。这里不比较determine的“决定，下定决心”义，也不比较learn的“学习（技能、语言等）”义。