基本解釋[經(jīng)濟學]鉛垂線校正英漢例句雙語例句The plumB line is always perpendicular to the horizontal plane.鉛垂線總是垂直于水平面的。plumb perpendicular更多例句專業(yè)釋義經(jīng)濟學鉛垂線校正