top the oil sand
... top tank air 油罐上部气层 top the oil sand 钻到油层 top tray 顶部塔盘 ...
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即将钻到的油砂层 farmer's sand
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不过，钻地更深并不是最佳的策略，因为最终钻头会钻到油层以下，撞上底部岩石。
Drilling further down wasn't the best solution though, because eventually the well would go below the oil and hit rock bottom.
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