订立dìnglì双方或几方把商定的事项用书面形式(如条约、合同等)肯定下来{conclude or make an agreement; (of two or more parties) confirm their decision (e.g. for a treaty or contract) made through discussion in a written form}: ～卫生公约{conclude a health treaty}|两国在平等互利的基础上～了贸易协定。{The two countries entered into a trade agreement on the basis of equality and mutual benefit.}