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.
与月球上相同，那些巨大陨石坑的范围（例如，那些巨大到自形成后尚未被尘埃填满的陨石坑）标志着火星表面的年龄。
Some of these properties appear to be evident in this iceberg, though the channel may have since been widened and enlarged by the subsequent tidal and surface melting and erosion.
虽然后来的潮汐和表面的融化与侵蚀可能加宽并扩大了这个河道，但是其中一些属性似乎在这个冰山上表现的很明显。
Since you like the outdoors, maybe you'll find a solution for soil erosion that will prevent the great rivers of the world from eroding their Banks.
因为你喜欢野外活动，也许你能找到办法解决土壤侵蚀问题，那样就可以防止世界上主要河流侵蚀其河岸的问题了。
Since the founding of New China, many measures have been taken to stop soil erosion.
新中国成立后采取了许多控制水土流失的措施。
Since estuaries protect animals and plants from storms and folds and prevent erosion, protecting estuaries is very important.
既然河口保护动植物免受风暴和洪水的影响，而且还可以防腐蚀，保护河口就非常重要。
The remote sensing research indicated that, since 80's in 20 centuries, the worsening trend of soil erosion in China has been controlled, but the general situation is still rigorous.
遥感调查表明，20世纪80年代以来，我国水土流失加剧的趋势初步得到控制，但总体形势依然严峻。
Such flow often causes very strong erosion on the river bottom during flood rising, since its behavior is different from ordinary silt carrying flow.
在这样的河流上，管道设计埋深是保障穿越工程安全的重要参数之一，它与河流的冲刷深度有关。
Such flow often causes very strong erosion on the river bottom during flood rising, since its behavior is different from ordinary silt carrying flow.
在这样的河流上，管道设计埋深是保障穿越工程安全的重要参数之一，它与河流的冲刷深度有关。
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