The temperature can drop below zero.
气温可以降到零下。
The temperature will drop below zero.
气温将降到零度以下。
Northeast China fine to cloudy, daytime temperature will above zero in, but at night and will drop below zero.
东北地区晴到多云，白天气温将在零度以上，但晚上又会降到零度以下。
The temperature will drop to five above (below) zero tonight.
今晚温度将降到零上(下)五度。
Colder still. The temperature will drop to five below zero.
更冷。气温将降至摄氏零下五度。
Colder still. The temperature will drop to five below zero.
更冷。气温将降至摄氏零下五度。
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