词汇	grade of hardness
释义	grade of hardness 硬度
随便看	database image data base image database imanagemen database implementation data base implementation database-independent data base independent data base-independent database index data base index database indexed search database indexing database industry data base industry database information data base information database information retrieval database initialize data base initialize database injection database in memory database in phase database input language database inquiry and library browsing data base inquiry and library browsing