现代商务礼仪教程:if you can buy a person's friendship,it's not worth having.麻烦哪位高人翻译一下

if you can buy a person's friendship,it's not worth having.麻烦哪位高人翻译一下 If you are t ,you can have a rest . If you think you can,you can If you think you can , you can . IF YOU THINK YOU CAN ,YOU CAN If you thank you can, you can If you can fine a big fish，you can travel on the land是什么意思？ 改错:This is a place which you can buy cheap things. If you buy a $5 sandwich, you'll get the second one at $2.50 or less than $2.50. If you can translate this sentence ,I can have a think这是什么意思啊