source

Compared meaning: where something comes from or begins (noun).

比较义项：事物产生、来源或开始的地方（名词）。

• source 本词

  The most neutral, general word for what something comes from or is supplied by; used for ongoing things like income, information, water or energy, with no implication of a problem or a historical starting point.

  语气最中性、最通用，指某事物的来源或供给处；常用于收入、信息、水或能源等持续存在的事物，不暗示存在问题，也不强调历史起点。

  Her main source of income is freelance writing.

  她的主要收入来源是自由撰稿。

• root

  Almost always used for a problem or trouble; names the deep, underlying cause that must be found before the problem can be solved, echoing the image of a plant's root; common in 'root cause'.

  几乎总是用于问题或麻烦，指必须先找到才能解决问题的深层根本原因，带有植物根部深埋地下的比喻色彩，常见搭配是root cause（根本原因）。

  Get to the root of the problem before it happens again.

  要在问题再次发生之前，先找到其根源。

• origin

  Emphasizes when or where something historically began, especially for words, customs, nations or people; used with 'of' or 'in', as in 'the origin of a word' or a country of origin.

  强调某事物在历史或地理上何时、何地开始，尤其用于词语、习俗、民族或人的出身，常与of或in连用，如the origin of a word（词的起源）或表示原产国。

  The origin of the custom can be traced back to ancient Rome.

  这一习俗的起源可以追溯到古罗马。

All three mean where something comes from. Source is the most neutral word, used for income, information, water, or energy. Root almost always names a problem's underlying cause, as in 'root cause'. Origin emphasizes when or where something historically began, like a word or custom.

这三个词都可以表示事物产生或开始的地方，但语气和搭配不同：source最中性，常用于收入、信息、水或能源等；root多用于问题或麻烦的根本原因，带有植物根部深埋地下的比喻色彩；origin强调历史或地理上的起源，常用于词语、习俗或人的出身。这里不比较root表示植物根部的字面意义。

Compared meaning: a person who gives information (noun).

比较义项：提供消息或情报的人（名词）。

• source 本词

  Source is the neutral, general term for a person, often unnamed, who supplies information to a journalist, researcher, or investigator; it does not imply secrecy or wrongdoing, as in "according to a source."

  source（消息来源）是较为中性、泛指的说法，指为记者、研究者或调查者提供信息的人，常常是匿名的，并不必然涉及秘密或不法行为，常见于“据消息人士透露”这类表达中。

  A newspaper report quoted an anonymous source close to the negotiations.

  一篇报道引用了一位接近谈判的匿名消息来源的话。

• informant

  Informant specifically means someone who secretly supplies information to the police or other authorities, usually about criminal activity and often in exchange for money or protection; it carries a stronger, more negative sense of betrayal.

  informant（线人、告密者）专指秘密向警方或其他当局提供信息的人，通常涉及犯罪活动，且常是为了获得报酬或保护；这个词带有更强烈、更负面的“背叛”意味。

  The detective paid his informant for tips about the drug ring.

  那位警探花钱让他的线人提供有关毒品团伙的情报。

Source and informant both mean someone who gives information. Source is neutral, often a person who informs a journalist or researcher. Informant secretly informs the police, often meaning betrayal. Source can also mean where something comes from; that is not compared here.

这两个词都表示“提供消息的人”，但语气和场合不同：source 较为中性，泛指为记者或研究者提供信息的人；informant 则强调秘密地向警方或当局告密，且常带有负面的“告密者”意味。这里不比较 source 的其他意义，例如“（水等的）来源、出处”。