这是一个晴朗无风的天气。
无风的天气和有利的潮汐是登陆行动所必须的。
Windless weather and favorable tides were required for the landing operations.
在无风的天气里，可以看到烟从烟囱中缭绕升起。
In the still air, smoke could be seen curling up from the chimney.
这是无风的天气。
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。
The heaviest, which shocked the world, was in 19 because of cold weather and windless conditions, polluted air covered the city.
再生能源需要有效的存储，才能在多云、无风天气及夜晚得以使用。
That means it needs to be efficiently stored so it can be utilized on cloudy, windless days and at night.
那是个无风无云的天气。
那是个无风无云的天气。
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