The weather is now hot, now cold.; It is sometimes hot and sometimes cold.
天气时热时冷。
What strange weather here -- now cold, now hot.
天气真是邪门儿，一会儿冷一会儿热。
The weather is now hot, now cold.
天气忽而冷忽而热。
What strange weather here — now cold, now hot.
这里天气也真邪门儿，一会儿冷一会儿热。
The weather is changeable these days, now cold, now warm.
这些日子天气多变，忽冷忽热。
The weather is now cold, now hot. (or: the weather is now cold, then hot.)
天气一会儿冷，一会儿热。
The weather is now cold, now hot. (or: the weather is now cold, then hot.)
天气一会儿冷，一会儿热。
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