词汇	aid to object teaching
释义	aid to object teaching 直观教具
随便看	standard loop antenna standard loran standard lost in a contest standard lot standard lot size standard lottery standard loudness reference standard low dosage urography standard low-dosage urography Standard Low-Frequency Range Approach standard ltest environment standard lumen standard luminance level standard luminance response standard luminosity curve standard luminosity function standardly standardly stratified algebras standard machine standard machine hour standard machine rate standard machinery standard machinery and electric products Standard Machinery Control System standard machine time