[countable] a place, person or thing that you get sth from来源；出处◆renewable energy sources可再生能源◆What is their main source of income?他们的主要收入来源是什么？◆These reports are a very useful source of information.这些报告是十分有用的消息来源。 [countable, usually plural] a person, book or document that provides information about sth提供消息者；消息来源◆According to an industry source (= sb working in the industry) a deal will soon be signed.根据业内人士透露，将很快签订一份协议。 ● at ˈsource
(Accounting 会计) used to show that money is taken from sb's income before they receive it在源头；一开始◆Income tax is normally deducted at source.所得税通常在税源上扣除。