英语短语词组词汇block signal sytem的音标、释义、翻译、用法及例句-英语短语词组词典-老街网

短语	block signal sytem
释义	block signal sytem 【控制系统】闭塞信号系统
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老街网英语短语词组词典共收录525608条英汉双解短语词组词条，基本涵盖了全部常用短语词组的翻译及用法，是英语学习的有利工具。