名词
中文翻译：分支隧道
同义词：
['subway tunnel', 'subway tube', 'subterranean tunnel']
例句：
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1. The branchtunnel is a crucial part of the underground transportation system.
分支隧道是地下交通系统的关键部分。
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2. They used to travel through the branch tunnel during their daily commute.
他们以前每天通勤时都经过这个分支隧道。
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3.The branch tunnel was closed for maintenance due to heavy rains.
由于大雨，分支隧道关闭进行维护。