片语
outer navigation channel外航道
navigation channel dredging航道疏浚
navigation channel variation航道变化
siltation in navigation channel航道回淤
deep navigation channel深水航道工程
south navigation channel南航道
estuary navigation channel regulation河口航道整治
signal for navigation channel通航水道信号
waterway航道;水路;排水沟
mountainous navigation channel regulation山区航道整治