1. the middle of the chief navigable channel of a waterway that forms the boundary line between states. 
   形成国家之间的边境线的水路上的主要航行路线的中间部分。
2. In case a non-navigable stream or man-made waterway becomes navigable after a dam or sluice gate structure is built, the construction unit shall simultaneously build ship passage facilities or reserve sites for such facilities, and the expenses needed thereby incurred shall be borne by the communication departments concerned, unless there are other State-provisions applicable. 
   　　在不通航的河流或者人工水道上修建闸坝后可以通航的，闸坝建设单位应当同时修建过船设施或者预留过船设施位置，所需费用除国家另有规定外，由交通部门负担。
3. navigable waters; a navigable channel. 
   可通航的水体；可通航的河道。
4. Navigable waters; a navigable river. 
   可通航的水体；可通航的河流
5. A river of southern England flowing about338 km(210 mi) eastward to a wide estuary on the North Sea. Navigable for large ships as far as London, it is the principal commercial waterway of the country. In its upper course above Oxford it is often called Isis. 
   西蒙斯河流程约338公里（210英里）的南英格兰河，向东流向北海宽湖三角湾。巨轮航运远至伦敦，它是该国主要商业水路。牛津以上上游部分通称为伊塞斯

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• 1. 通航水道
  navigable pass 通航水道...navigable waterway 通航水道...navigation 航行
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