基本解释[機械工程]輕鉛筆線英汉例句雙語例句Using a ruler, mark a light line with your pencil down the left-hand edge, about 1-2cm in.用尺子在左邊畫一條直線，離邊緣1-2厘米。light pencil line更多例句专业释义機械工程輕鉛筆線