冲击磨料磨损是一种极恶劣的磨损工况。
Impact abrasive wear is one of the worst conditions on abrasion.
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有的在他们自己人中间本来穷凶极恶，此刻却显得孩子般的恭顺。
Some, who when among themselves were most violent, now appeared as submissive as children .
野营者们经历了极恶劣的天气。
The campers were subjected to extreme weather.
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