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main drain /ˈmeɪn ˈdɹeɪn/ n

中文：主排水管

中文 · 主排水管Español · desagüe de fondoFrançais · bonde de fond
Meaning：Opening covered by a grate; it is used to channel water to the filter or to drain the pool.
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Found in these illustrated scenes（1）

In-ground pool

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