1. 名詞
   不可數名詞: 關心
   關懷
   concern for ...(人事物):
   對...的關心
   對...的關懷
   可為可數與不可數名詞:
   /複數為"concerns"/
   擔憂, 擔心
   憂慮, 掛念
   牽掛, 記掛
   

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   同義字詞
   business,company,enterprise,establishment,firm,house,interest,outfit
   agitation,anxiety,anxiousness,apprehension,apprehensiveness,care,concernment,disquiet,disquietude,fear,nervousness,solicitude,sweat,unease,uneasiness,worry
   

2. 動詞
   及物動詞:
   關係到...(人事物)
   涉及...(人事物)
   影響到...(人事物)
   有關...(事物)
   使...(人)擔心
   使...(人)操心
   使...(人)不安
   使...(人)憂慮
   令...(人)牽掛
   

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   同義字詞
   cover,deal (with),pertain (to),treat (of)
   affect,involve,touch
   agitate,ail,alarm,alarum,bother,derail,discomfort,discompose,dismay,disquiet,distemper,distract,distress,disturb,exercise,flurry,frazzle,freak (out),fuss,perturb,undo,unhinge,unsettle,upset,weird out,worry
   

3. 副詞
   as far as ...(人) is/are/am/was/were concerned:
   對...來說
   在...看來
   as far as ...(事) is/are/was/were concerned:
   就...而言
   至於...
   as far as ...(動詞ing ...) is/was concerned:
   就做...而言
   至於做...
   

4. 語法
   To whom it may concern:
   (用於正式信函)致相關人員/
   敬啟者/
   給有關人士
   

例句

1. KJ: That's exactly the concern .
2. Price fixing was a key concern .
3. Employee retention is a concern .
4. Soil degradation is another concern .
5. Don't concern Dave in our party planning.
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