单词	上口--边--上缘
释义	上缘，上口，缘，边brim
随便看	required space required spark plug voltage required study required subject required supply rate required thickness required time required value required volume requirement requirement analysis requirement analysis tool requirement contract requirement definition phase requirement description language requirement engineering requirement engineering and validation requirement explosion requirement generation process requirement, irrigation requirement of politeness requirements requirements acquisition and controlled evolution requirements acquisition and controlled evolution--race requirements acquisition and controlled evolution，race