The day dawned sunless and with a low cloud base.
黎明時天氣陰沉，云層壓得很低。
Fog and low cloud cover are expected this afternoon.
預計今天下午有霧和低空云層。
The moon was fuller than the night before, but the light was diffused by cloud.
月亮比頭一天晚上更圓，但因云層遮掩而月光朦朧。
The wind has changed direction.
風向已經變了。
Wind speeds reached force five.
風速達到了5級。