n.关心；关心的事；忧虑，担心
vt.涉及；影响；关心；（使）担心
n.公司；企业
Provision of shelter was their main concern for the disaster victims. 为灾民提供避难处是他们最关切的事。
I am not insensible of your concern. 我不是没察觉到你的忧虑。
Rarely would a single concern have the entire facilities required for a complete testing program. 很少有一个公司能拥有为完成整个试验大纲所需要的全部设备。
TCL is a large concern in our country. 是我们国家的一个大企业。
用作及物动词 (vt.)The theory of relativity is concerned with two seemingly opposite ideas. 相对论涉及两个似乎对应的概念。
As a rule this concerns only part of the whole terminator 通常这只是影响地界线的一部分。
Local industry should concern itself with local needs . 地方工业应关心本地的需要。
so far as ... is/are concerned，as far as ... is/are concerned，so far as concerns和as concerns都是“就...而言”的意思。注意后两种表达中concerns用复数不用单数；
concern to后加不同动词有不同目的。 He was concerned to hear of her ill health.to hear表示原因 He was concerned to improve her health.to improve表示目的
concern后加不同介词时，表示不同意思。 He was concerned about the matter.他为了这件事关心或担心。 He was concerned in the matter.他参与了这件事。 He was concerned with the matter.他跟这件事有关。
be concerned with常与concern意思相同，concerned with常与concerning意思相同。下面两句子意思一样： The story is concerned with a national hero.The story concerns a national hero.这个故事牵涉到一个民族英雄。
concerned等于that is concerned或who are concerned，如everybody concerned (每个有关的人)，all concerned (有关各方) 和the department concerned (有关部门）。注意that is不可写出；
your concern for me意为“你对于我的关怀”，your concern over me 意为“你对于我的担心”；
To whom it may concern或To Whom It May Concern用在不指明收信者是谁的信里，当作称呼语。这种信通常没有Yours，turely等信尾客套语。
v.(动词)concern的基本意思是“与…有关”,指人〔物,事物〕之间的联系与影响,引申可指“关心”“关切”“使担忧”“使烦恼”。
concern作“与…有关”解时是及物动词,接名词、代词或名词从句作宾语。可用于被动结构。
concern作“担心”“挂念”解时,主语一般是人,常与介词about, for或over连用。
concern常与指人的反身代词连用,表示“关心,关注”，其后常接介词about, in或with。
concern后可接由that, where或how等关系代词引导的从句。
concern的过去分词concerned在句中常作后置定语。
