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concrete drain /ˈkɒŋkɹiːt ˈdɹeɪn/ n

中文：混凝土排水沟

中文 · 混凝土排水沟Español · canal de drenajeFrançais · canal d’écoulement
Meaning：Small concrete trench used to drain off the product in the event of a spill or when the tank is emptied.
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Found in these illustrated scenes（2）

Oil storage tank Oil storage tank

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