1
hoarfrost forms on [sth]
Hoarfrost formed on the grass overnight.
一夜之间，白霜凝结在草地上。
白霜
先理解核心含义，再看它在真实句子里的用法。
白霜
ice crystals that form a white deposit on outdoor objects
Hoarfrost formed on the grass overnight.
一夜之间，白霜凝结在草地上。
形成白色沉积的冰晶(尤其是在室外物体上)
ice crystals forming a white deposit (especially on objects outside)
The fields were covered with hoarfrost early in the morning.
清晨田野上覆盖着一层白霜。
According to the weather report, hoarfrost may form on bridges tonight.
根据天气预报，今晚桥面上可能形成白霜。
As the sun rose, the hoarfrost on the window began to melt.
太阳升起时，窗户上的白霜开始融化。
Hoarfrost formed on the grass overnight.
一夜之间，白霜凝结在草地上。
The rooftops were covered with hoarfrost.
屋顶被白霜覆盖。
hoarfrost 是不可数名词，通常不加冠词。
Hoarfrost glistened in the morning sunlight.
白霜在晨光中闪烁。
Not this
There is a hoarfrost on the leaves.
Use this
There is hoarfrost on the leaves.
白霜是物质名词，不可数，因此不能用冠词a修饰。
Not this
The weather forecast says there will be hoarfrost tonight.
Use this
The weather forecast says there will be frost tonight.
hoarfrost特指物体表面形成的白色冰晶，而天气预报中通常用frost泛指霜冻现象。
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常用作不可数名词
Dictionary facts from ECDICT, WIKTIONARY.