名词
中文翻译：阻塞信号机
同义词：
['阻塞机，阻塞装置，阻塞装置例句：1. The block signal machine was used to control traffic flow.（阻塞信号机被用来控制交通流量。）2. The engineer had to block the signal machine to fix the problem.（工程师不得不封锁信号机来解决问题。）']
例句：
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1. The block signal machine was used to control traffic flow.
阻塞信号机被用来控制交通流量。
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2. The engineer had to block the signal machine to fix the problem.
工程师不得不封锁信号机来解决问题。
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3. The block signal machine was a crucial part of the railway system.
阻塞信号机是铁路系统的关键部分。