对石油工人所有的科学探测方法来说，能确切地知道地下是否有油的唯一方法就是钻一口井。
For all his scientific methods of detection the only way the oilman can actually know for sure that there is oil in the ground is to drill a well.
我没有通知费尔法克斯太太回家的确切日子，因为我不希望派普通马车或是高级马车到米尔科特来接我。
I had not notified to Mrs. Fairfax the exact day of my return; for I did not wish either car or carriage to meet me at Millcote.
哈利法塔共有160多层，但确切层数尚不清楚。
The Burj Khalifa boasts more than 160 stories. The exact number is not known.
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