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来源:雅诚德英语网
Because of the cold temperatures, the tundra has two layers: top layer, which is called the active layer, is frozen in the winter and spring, but thaws in the summer.
由于寒冷的气温,冻土带有两层:最上面的一层被称为活动层,在冬季和春季被冻结,但在夏季解冻。
Because of the cold temperatures, the tundra has two layers: top layer, which is called the active layer, is frozen in the winter and spring, but thaws in the summer.
由于寒冷的气温,冻土带有两层:最上面的一层被称为活动层,在冬季和春季被冻结,但在夏季解冻。