One recent morning, a different note—fainter than the root note, but easily discernible—pealed distinctly in the middle of my right ear, a lone stalactite hanging in a cave.

最近一个早上，我听到了一个不同的调——比根音要弱一点，可还是容易辨别——在我的右耳里鸣着，像一个洞穴里的钟乳石一样贮在那儿。

youdao

Researchers from the University of Colorado at Boulder examined stone tools dating from the Middle stone Age, some 75, 000 years ago, from Blombos Cave in what is now South Africa.

美国博尔德科罗拉多大学的研究人员仔细检查了这些来自南非布龙·保斯山洞的石器，它们可追溯到中石器时代，有些甚至可追溯到75,000年前。

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Dumbledore was standing in the middle of the cave, his wand held high as he turned slowly on the spot, examining the walls and ceiling.

邓布利多已经站在岩洞中央，魔杖高高地举在手里，他原地缓缓地转着圈，仔细查看着岩壁和洞顶。

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They also know that by the middle fifteen hundreds people left their villages and cave homes and moved south and east toward the Rio Grande River.

VOA: special.2010.07.05

The news out of Tunisia in the past week has been depressingly familiar for the Middle East: roadside bombs badly wounding soldiers and police as they comb a cave-filled mountainous region for al-Qaida linked militants.

NPR: Jihadi Peril Makes Its Way To Tunisia