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His only connection to the outside world was an air tube and a bell.
僧人与外界唯一的联系就只通过通气管与铃声。
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The form of air path connection: connected with spiral tube .
电路连接形式：螺旋七芯线快插头。
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The form of air path connection: connected with spiral tube .
电路连接形式：螺旋七芯线快插头。
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