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like: das Öl → →
das Öl ☊ dầu ăn ☊ ☊
Hat der Behälter für das Öl ein Loch? ☊ Hay bình chứa dầu bị thủng? ☊ (Lektion 68, Nr. 973)
They drilled through several layers of rock to reach the oil. ☊ rock ☊