1. The surface of the moon is pitted with craters.
月亮的表面布满陨石坑。
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2. Put bomb craters in there.
把弹坑放那里面。
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3. On Mars, there are relatively few craters less than 5 kilometers in diameter.
在火星上，直径小于5公里的陨石坑相对较少。
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4. From radio survey data, we know that the basin contains lots of smaller craters.
根据无线电测量数据，我们可以得知盆地里有许多较小的陨石坑。
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5. However, Martian craters get filled in considerably faster than their lunar counterparts.
然而，火星陨石坑被填满的速度比月球陨石坑快很多。
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6. Heat could be retained as debris fall back into impact craters, creating an insulating blanket.
当碎片落回撞击坑时，热量可以被保留下来，形成隔热层。
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7. Some wells are vast, open craters with hundreds of steps paving each sloping side, often in tiers.
有些井是露天的巨坑，每个斜边都有几百级台阶，通常是一层一层的。
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8. In other areas, you've got canyons, ripped valleys, meteo craters, lava domes, these lava formations that look like giant pancakes.
在其他地区，你会看到峡谷、裂谷、陨石坑、熔岩圆顶，这些熔岩构造的形状看起来就像巨大的煎饼。
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9. To date, several such secondary craters have been found along Mexico's Yucatan Peninsula, and heat-shocked quartz has been found both in Mexico and in Haiti.
10. You know planetary researchers love studying deep craters to learn about the impacts that created them, and how they redistributed pieces of the planet's crust.
11. The Mariner spacecraft found that the surface of Mars, as well as that of its two moons, is pitted with impact craters formed by meteoroids falling in from space.
水手号宇宙飞船发现火星表面，还有它的两个卫星表面，都有由太空坠落的流星体造成的陨石坑。
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12. Massive projectiles striking much larger bodies create various kinds of craters, including multi-ring basins—the largest geologic features observed on planets and moons.
13. Massive projectiles striking much larger bodies create various kinds of craters, including "multi-ring basins"—the largest geologic features observed on planets and moons.
14. As on the Moon, the extent of large impact cratering (i.e. craters too big to have been filled in by erosion since they were formed) serves as an age indicator for the Martian surface.
15. Any water molecules that found their way to the floors of craters near the moon's poles, that water would be perpetually frozen, because the floors of those craters are always in shadow.
16. If we had rock samples to study, we'd know whether these small craters were formed by impacts during the final stages of planetary formation, or if they resulted from later meteor showers.
17. From the small number of impact craters that appear on Martian lava flows, one can estimate that the planet was volcanically active as recently as a half-billion years ago—and may be active today.
