1、faith n .信赖的事情；保证；诺言；约定，誓约

2、plight vt. 许婚；以身相许

3、promise v/n 承诺, 诺言

4、stipulation n. 契约;规定;条

5、troth n. 誓言

短语搭配

1.约定定义 stipulative definition;

2.约定呼叫（电话） appointment call;

3.约定货载 booking cargo;

4.约定面谈时间 appointment for interview;

5.约定价值 agreed value; commitment value;

例句

The absolute number that you assign to it is something that's arbitrary. You have to set what the zero is. And so there's a well-understood convention for what the zero is.

你指定给它的绝对值是有任意性的,你需要设定零点的位置,因此有一个经过充分研究的,关于设定零点的约定。