放行 let sb. pass 申請(qǐng)放行 request clearance; 放行信號(hào) all-clear
行船 sail a boat; navigate 行船到最近的港口 navigate the ship to the nearest port; 逆風(fēng)行船 sail against the wind; 順風(fēng)行船 sail before the wind; 順流行船 navigate down the stream
國(guó)際航行船舶的監(jiān)管 supervision and control over vessels engaged in international navigation