基本解釋[機械工程]后座閥英漢例句雙語例句A step on the stem has now been back-seated against the upper portion of the valve body.閥 桿上的臺階現(xiàn)在已經(jīng)坐落在閥體的上面部分上。back-seated valve更多例句專業(yè)釋義機械工程后座閥