1·The heaviest, which shocked the world, was in 19 because of cold weather and windless conditions, polluted air covered the city.
最严重的是在19年，因为寒冷的天气和无风的条件，污染的空气覆盖了城市，这震惊了整个世界。
2·To prepare for the power fluctuations endemic to renewable energy, we'll need to inventory excess power to use during cloudy, windless afternoons and nights.
为预备可再生能源发电中出现的发电量波动，我们需要储备过剩的电能以保证多云、无风的午后和夜晚的用电。
3·Windless weather and favorable tides were required for the landing operations.
无风的天气和有利的潮汐是登陆行动所必须的。
4·Under windless condition or in gentle breeze, it can be calculated either through outside compound sprinkler tests or with experimental data from single sprinkler test.
在无风或微风条件下，可通过室外组合喷洒试验或依据单喷头试验资料用计算方法求得。
5·But even on windless days the air always smelt of something under-earth: sulphur, iron, coal, or acid.
甚至无风的时候，空气里也带着一种地窖下的什么恶味。