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be open to navigation or air traffic
open to navigation
exchanges of air and shipping services
be open to navigation (or air traffic)～点points of call/～水道navigable waterway/～水域navigable waters
英汉词典共收录311570条英汉翻译词条，基本覆盖所有常用英文单词的例句及中文翻译，是不可多得的英语学习材料。