可: approve通航: be open to navigation or air ...的: 4次方是 The fourth power of 2 i ...上游: the upper reaches a surname段: section; segment; part; para ...可通航的: navigable可通航的海岸: accessible coast可通航的水道: navigable waters周围可通航的: circum navigable上游段: torrent tract; upper course; upper reach可通行的；可用的,可以通航的: passable通航的: navigable上游段；上流段: upstream section感潮区上游段: head of tide water可通航坝: navigable dam可通航宽度: navigation span可通航水深: depth of navigable water可通航性: navigability不能通航的: innavigable; u avigable; unnavigable不通航的: innavigable; unnavigable可以通航的: passable墩的上游端: upstream pier nose堰的上游: back of weir沙丘的上游侧: upstream side of dune堰的上游护面: upstream facing of weir
