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to close by coming together (like the lips of a wound, the doors of an elevator, the walls of a channel)
to close by connecting in a loop (like a circuit)
closed-loop
江苏热线英汉汉英双解词典包含207361条英汉翻译词条，涵盖了常用英语单词及词组短语的翻译及用法，是英语学习的必备工具。