It's very dangerous to walk on an ice-covered lake in spring.

春天在结冰的湖面上走是很危险的。

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This hungry fox ended up a victim of the sub-zero temperatures when it chased a duck across an ice-covered lake - and froze to death.

一只饥饿的狐狸在结冰的湖面追赶野鸭，结果冻死在冰点下的水中。 图片由摄影师蒂姆·伍德科克于南安普顿的汉特斯附近的阿什利特水塘处拍得。

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The lake was covered with a sheet of ice.

湖面上覆盖着一层冰。

《牛津词典》

Freeze dates are defined as the observed period when a lake or river was completely ice-covered, and break-up dates as the last ice break-up seen before the summer open-water phase.

BBC: Ice records reveal warming trend