Fog turning into frost forecasts the coming of winter.
雾变成霜预示着冬季的到来。
Keep sources of ignition away for 30 minutes after all frost or fog has disappeared.
远离火源30分钟,直到所有的霜和雾都消失。
The only small-scale weather modification other than local frost prevention is that of clearing an airport or airstrip of fog.
除局地防霜外,唯一的小尺度人工影响 天气 作业是清除航空港或简易机场上的雾。
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