墙面基层必需干燥、牢固、无尘埃。
2000年3 月，由闪电引起的失火持续了不到十分钟，但极大地破坏了制造硅片所需的几无尘埃的环境6爱立信难以找到替代货源，之后报称其手机部门当年亏损超过20亿美元。
The fire, in March 2000, started by a bolt of lightning, lasted less than 10 minutes, but it caused havoc to the super-clean environment that chipmaking requires.
超新星爆炸的这种独一无二的环境使得天文学家们有机会观察这些来自超新星的凝结尘埃--这种尘埃在红外线中通常因为太冷而无法放射出光。
The unique environment into which this supernova exploded makes it possible for astronomers to observe the condensed dust from the supernova that is usually too cold to emit in the infrared.
应用推荐