fiducial indicatorleft right indicatorleft-right indicatorleft-right instrumentnull detectornull indicatorzero indicatorzero position indicatorzero reader零位: zero position; zero; null指示器: indicator; pointer; director ...提前高度零位指示器: altitude prediction zero indicator潮位指示器: tidal gage; tide indicator档位指示器: shift indicator(shift torwer)下载手机词典可随时随地查词查翻译