It has been raining heavily all day.
一整天雨都下得很大。
《柯林斯英汉双解大词典》
It was raining heavily.
雨下得很大。
《牛津词典》
It was raining heavily and visibility was poor.
当时天下着大雨，能见度很低。
It had been raining heavily and the fisherman, I thought, had probably assumed that they would rather stay indoors.
BBC: The darker side of sunny Gambia
If 90% of cars on one stretch of highway have their wipers on full blast, they could know it's raining heavily.
FORBES: Magazine Article
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