愛華網(wǎng)relation和relationship都是解關(guān)系，很多時候可以互通，relationship比較講情感上的關(guān)系，relation則比較講工作上的關(guān)系?，F(xiàn)在分析各個情況：
一、國與國的正式邦交一定用relations，注意這里一定要用復(fù)數(shù)。
1.Canadaand Britain have established diplomatic relations with NorthKorea.
2.Britainthreatened to break off diplomatic relations with theregime.
但國與國之間的關(guān)系則可以用relations（必須用復(fù)數(shù)）或relationship（可數(shù)名詞），情感上的關(guān)系尤其會用relationship。
1.US-Chinese relations (OxfordDictionary)
2.We seekto improve relations between our two countries. (LongmanDictionary)
3.TheChinese President has said the China will maintain its traditionalfriendly relationship with Bangladesh.
4.thespecial relationship between Britain and the US (LongmanDictionary)
二、人與人之間的關(guān)系既可用relations（必須用復(fù)數(shù)）或relationship（可數(shù)名詞）。relations通常是指工作上的關(guān)系，relationship通常是指情感上的關(guān)系。
1.Relations between workers and management aregenerally good. (Longman Dictionary)
2.I havequite a good relationship with my parents. (LongmanDictionary)
3.She hasa close relationship with her daughter. (LongmanDictionary)
三、物與物之間的關(guān)系既可用relation（countable anduncountable），也可用relationship（countable anduncountable）。兩個字完全互通。bear no/little relation/relationshipto是一個固定詞組，與…沒有關(guān)系。
1.therelation between rainfall and crop yields (OxfordDictionary)
2.therelationship between poor housing and health problems (LongmanDictionary)
3.The feethey are offering bears no relation to the amount of work involved.(Oxford Dictionary)
4.Thelessons bear little relationship to the children's actual needs.(Longman Dictionary)
四、情侶關(guān)系用relationship（可數(shù)名詞），性關(guān)系則是sexualrelationship（可數(shù)名詞）。情愛的關(guān)系不用relation。
1.Shedoesn't really want a relationship with me. (LongmanDictionary)
2.She'shad a series of miserable relationships. (OxfordDictionary)
3.Are youin a relationship right now? (Longman Dictionary)
4.He'snever had a sexual relationship before. (LongmanDictionary)
五、有血緣關(guān)系的人=blood relation/bloodrelative（可數(shù)）
He couldbe the next-door neighbor, a friend, a blood relation. (LongmanCorpus)
六、其它:
勞資關(guān)系=labour relations/industrialrelations
1.acompany with good labour relations (Longman Dictionary)
2.Nationalization in the transport industriesproduced neither outstanding industrial relations nor employeecommitment. (Longman Corpus)
公共關(guān)系=public relations
1.publicrelations exercise是固定詞組，指改善公關(guān)的工作。
2.Theproject has been disastrous for the bank in terms of publicrelations. (Longman Dictionary)
3.Newcastle manager Kevin Keegan looked upon thetournament as a public relations exercise rather than a moneymakingventure. (Longman Corpus)
4.Thetour was considered to have been a successful public relationsexercise. (Longman Corpus)
5.It hasbeen a public relations exercise for this week's by-elections.(Longman Corpus)
種族關(guān)系=racerelations
1.We needto do more to promote good race relations. (LongmanDictionary)
2.Community leaders are working to improve racerelations in the city. (Longman Dictionary)
3.Hawaiihas a tradition of good race relations. (LongmaeDictionary)
這三個關(guān)系都是用relations（必須用復(fù)數(shù)）。
Definitionsofsite1:
Relation:blood ties; cognation;common ancestry; consanguinity; family ties; kinship; line;relationship;
Relative:agnate; aunt; brother;brother-in-law; cognate; cousin; father-in-law; grand-aunt;grand-daughter; grandfather; grandmother;
grandson; grand-uncle; great-aunt; great-uncle; kinsman; kinswoman;kissing cousin; kissing kin; mother-in-law; near relation;
nephew; next of kin; niece; relation; sister; sister-in-law;stepbrother; stepfather; stepmother; stepsister;uncle;
Definitions of site2:
Relative：person connected byblood or affinity;strictly,one allied by blood;a relation;a kinsmanor kinswoman.
Relation:aperson connected by consanguinity or affinity; a relative; akinsman or kinswoman; a person related by blood ormarriage.
Relationship:the state ofbeing related by kindred, affinity, or otheralliance.
Kin: relatives;persons of the same family orrace.
下面這些，也很有意思，最簡單的也是最實用的：
Father: onewho has begotten a child, whether son or daughter; a generator; amaleparent.
Mother: a female parent; especially, one ofthe human race; a woman who has borne achild.
Parent: onewho begets, or brings forth, offspring; a father or amother.
Grandfather:a father's or mother's father;an ancestor in the next degree above thefather or mother in linealascent.
Great-grandfather&great-grandmother: the father of one's grandfather or grandmother. And themother of one's grandfather orgrandmother.
Child:ason or a daughter; a male or female descendant, in the firstdegree; the immediate progeny of humanparents.
