科学家推测，这是一种季节性效应，如果真是这样的话，在未来几年内随着北半球进入春季，这种季节性效应也会改变。

Scientists speculate that this is a seasonal effect, and if so, it will change as the northern hemisphere enters springtime during the next few years.

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火星的北半球正值春季，但我们听不到鸟儿歌唱。

It is spring in northern Mars, but no birds are singing.

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北半球的春季剩一个月就到来了，在春天的第一天来到之前，让我们再看一眼过去几个月里寒冷下雪的冬季。

With one month of the season left before the first day of Spring in the Northern Hemisphere, take a look at the cold, snowy days of the last couple months.

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