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main supply pipe /ˈmeɪn səplˈaɪ ˈpaɪp/ n

中文：主供水管

中文 · 主供水管Español · surtidor principalFrançais · canalisation d’alimentation
Meaning：Pipe carrying the hot water to the radiators.
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Found in these illustrated scenes（1）

Forced hot water heating

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