fix up1. [口语]修理；修补；修缮
We shall have to fix the house up before we can sell it.我们得把房子修缮了后才能出售。
2. [口语]为…作好安排；安排；为某人定约会日期：We must meet again to fix up the details of the contract.
我们得再见一次面，来安排合同的细节。3. [口语]向(某人)提供(某物)，提供(某物)给；给(某人)介绍(男友、女友)，为(某人)结识异性朋友作安排：
Ask your brother to fix you up with a nice girl.
请你哥哥帮忙给你介绍一位可爱的姑娘。
I know someone who should be able to fix you up.我知道有个人能提供你所需要的东西。
4. [口语]给(某人)安排住宿：
We were fixed up for the night in a good hotel.我们被安置在一家好旅馆里。
5. [美国口语]盛装，打扮：
Do I have to fix up to go to the Websters?我去韦伯斯特家是不是得打扮一下?
6. 治愈：The doctor fixed him up.那位医生治好了他的病。
repair1 [ri'pε?] vt.
1. 修理；修补；修整：
My bicycle has to be repaired.我的自行车需要修一修。
2. 恢复；治愈：
It will take a long time to repair a broken marriage.要使破裂的婚姻重新恢复需要很长时间。3. 纠正；补救：
I'll try to repair the error I have made.我将设法纠正我犯的错误。
4. 弥补；补偿；赔偿：You have to repair the damage you have caused.
你必须赔偿你所造成的损失。
vi.可以修理；可修复：
The overcoat is so old,it won't repair.这件大衣太旧了，不能修补了。
n.1. 修理；修补；修复
2. [常用复数]修理工程；整修工作
3. 维修状况；保养状态
4. [用复数]修理费，维修费近义词:mend .
repair2 [ri'pε?] vi.1
. 去，往：She repaired to Qingdao for the summer.她去青岛避暑去了。
2. 合伙去；经常去(常与 to 连用)：They used to repair to the club.过去他们常去俱乐部。
3. 求助(常与to连用)：
He always repairs to his friends when he has trouble.他遇到麻烦事时总是求助于他的朋友们。
4. [废语]回来(与from连用)n.[古语]常去之处；巢穴
对比单词很难的，你可以相信的只有词典，所有老师讲的都只能是从某个角度出发，或说有特定的语境。