坑

Photograph by John Stanmeyer, National GeographicThe Maya believed natural wells, such as the Xkeken cenote in Mexico's Yucatán, led to the underworld.

玛雅人相信，诸如墨西哥尤卡坦半岛上的斯科肯石灰岩坑之类的天然深井是通向地狱的。

Xkeken Cenote, Mexico

斯科肯石灰岩坑，墨西哥

Cenotes are freshwater sinkholes usually found on the Yucatán peninsula.

洞状陷穴是淡水灰岩坑通常发现在尤卡坦半岛。

Black and sheer, the spurs and chasms went up in front of them and fell away beside them into blackness.

Black and sheer，石刺和深坑在他们的面前出现，然后又消逝在他们身后的黑暗之中。

Bottomless wales and boundless floods, and chasms

无底的地垄，无际的洪水和深坑

The isotopic abundances of rare gases and cosmic-ray exposure ages of asteroid meteorites, planetary meteorites and the Apollo lunar samples applied to clue up and understanding cosmic-ray exposure history of parent bodies of different meteorite types, collision events, the relationship between cosmic-ray exposure ages and heliocentric distance of the parent bodies, irradiation history of precompaction exposure of chondrules, pairing meteorites for the Antarctic meteorites and desert meteorites, the ejection history of planetary meteorites, and relative ages of lunar craters and so on.

小行星陨石、行星陨石及阿波罗月球样品的稀有气体同位素丰度和宇宙射线暴露年龄，已广泛应用于探索和了解不同类型陨石母体的宇宙射线暴露历史、冲击碰撞事件、暴露年龄与日心距离的关系、吸积形成母体前硅酸盐球粒的辐照历史、南极和沙漠陨石中成对陨石的判别、行星陨石的溅射历史及月坑的相对年龄等关键词：宇宙射线暴露年龄；陨石；球粒陨石；无球粒陨石；火星陨石；中铁陨石

Come now, let's kill him and throw him into one of these cisterns and say that a ferocious animal devoured him.

来吧。我们将他杀了，丢在一个坑里，就说有恶兽把他吃了。

Come now, let's kill him and throw him into one of these cisterns and say that a ferocious animal devoured him.

来吧！我们将他杀了，丢在一个坑里，就说有恶兽把他吃了，我们且看他的梦将来怎么样。

Come now, let's kill him and throw him into one of these cisterns and say that a ferocious animal devoured him.

来罢、我们将他杀了、丢在一个坑里、就说有恶兽把他吃了、我们且看他的梦将来怎麼样。

Changes of the surface of femoral and tibial condyles cartilage ware observed before and after exercise with scanning electron microscope.

实验评估：扫描电子显微镜下观察训练前后兔股骨和胫骨髁软骨表面形态结构的变化；MIAS99图形处理软件计算浅坑的直径和面积。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。