寒冷的春季会自然控制昆虫的数量。
A cold spring will provide a natural check on the number of insects.
这个“跷跷板”带来了极度寒冷的周期性的严冬和东风，然后突然转换成多年的阴沉春季、过早降雨的夏季和温和的冬季，以及频繁的大西洋海浪。
The "seesaw" brought cycles of intensely cold winters and easterly winds, then switched abruptly to years of heavy spring and early summer rains, mild winters, and frequent Atlantic waves.
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.
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