这个陨石坑现在深埋在沉积物中，最初直径约200公里。

The crater, now deeply buried in sediment, was originally about 200 kilometers in diameter.

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真正的危险来自于直径超过1公里的天体，它会造成大量的沉积物，来破坏环境以及导致全球粮食歉收。

The real danger would come from an object more than a kilometer in diameter, which could kick up enough sediment to cause environmental damage and crop failures worldwide.

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在此基础上，研究了轴流压缩机叶栅内不同直径粒子在叶片压力面和吸力面的沉积规律；

Then the deposition characteristic of different particle diameters in the blade cascade of the axial compressor was obtained.

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