英语词汇“I heard of it before”的翻译、意思、用法、释义-英汉汉英双解词典

词汇	I heard of it before
释义	I heard of it before. 我先头就听人说起过这件事。
随便看	ballast piping arrangement ballast pit ballast plan ballast plants ballast / PLC ballast plough ballast plow ballast pocket ballast pollution ballast port ballast pressure ballast principle ballast profile ballast pump ballast pump control system ballast pumping arrangement ballast pumping control ballast pumping system ballast pump room ballast pump status-indicating system ballast rake ballast raking equipment ballast ramming ballast ramming , ballast consolidating ballast ratio