A plug had been inserted in the drill hole.

那个钻孔里已经塞上了塞子。

《柯林斯英汉双解大词典》

"The drill hole is just a pinprick on an elephant's back," he said.

“钻井对于整个岩浆体来说只不过是大象背上的一个小针孔。”马施说。

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The options include enlarging the drill hole or digging a new shaft.

现在的方案有两个：一是扩大现有的通道，二是钻一个新的通道。

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Later tests found oxygen levels at about 7 percent -- too little to survive -- but that may be because the drill hole drifted as it was being bored, Stickler said.

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Curiosity has already seen plenty of evidence for past running water in Gale Crater and the results from the drill-hole analysis are expected to reveal further information about that wet history.

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The hole under way is the excavation hole, where the drill bit will be placed.

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