短語詞組短語quarter -turn ball valve 直角回轉(zhuǎn)球閥double quarter -turn 帶有斜踏步的雙直角轉(zhuǎn)彎樓梯belt quarter -turn drive 皮帶直角轉(zhuǎn)彎傳動(dòng)reversible quarter -turn plough 雙向四分之一翻轉(zhuǎn)犁 返回 quarter-turn