agreement与contract有何区别

他们很相似，但是仍然是有区别的，简单的来说,‘contract’ 要比 ‘agreement’更加正式，更具有法律效应。

下面这些解释可以供你参考：
A contract is an agreement between parties that will legally enforceable. A simple "agreement" is an arrangement between the parties which may or may not contain the necessary elements to be enforceable before a court of law. A valid contract must contain the seven valid elements which are:
· Offer
· Acceptance
· Consideration
· Intention
· Form
· Genuine consent
· Legality

再加一些：
The terms are sometimes used interchangeably. Quite often the word "contract" can mean the document containing the agreement, but "agreement" can be used in that sense too. Contract also tends to be used to mean a binding or formal agreement. Law students study the law of contract, rather than the law of agreements.

ps：你肯定可以看懂的吧，我就偷懒不翻译了，呵呵

在英语中，合同一般称为Contract，协议一般称为Agreement。何谓“Contract”？

1999年中国《合同法》