这些颗粒锋利而粗糙的性质，暗示着它们能损坏飞行器的机体和舷窗——这会降低可见度。
The sharp, abrasive nature of the particles suggested they could have damaged the bodies of aircraft and the Windows - reducing visibility.
他们用特殊的超细纤维来替代粗糙的砂石颗粒，以强化水泥。
They used special microfibers, rather than coarse bits of gravel and sand, to strengthen the cement.
火山喷发早期出现的火山灰颗粒特别锐利且粗糙，对通过它的飞行器可能造成威胁。
Ash particles from the early part of the eruption were especially sharp and abrasive, posing a possible threat to aircraft flying through the cloud.
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