双语例句
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一桶石油要多少钱?。
How much does <em>a</em> <em>barrel</em> <em>of</em> <em>oil</em> cost?
a barrel of oil
一桶石油要多少钱?。
How much does <em>a</em> <em>barrel</em> <em>of</em> <em>oil</em> cost?