名词
中文翻译：港口环
同义词：
['port ring', 'port circle', 'port ring system']
例句：
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1. Theport ring is a crucial part of the city's transportation network.
港口环是城市交通网络的重要组成部分。
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2. The port ring is designed to improve the efficiency of cargo handling.
港口环旨在提高货物处理的效率。
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3.The port ring has been expanding rapidly in recent years, attracting more and more international shipping companies.
近年来，港口环迅速扩张，吸引了越来越多的国际航运公司。