Ok, a lot of people think of earths orbit around the sun as being perfectly circular, as smooth and as regular as, say, the way that hands move on a well-made watch, but it just doesnt work that way. You are probably aware that the earths orbit around the sun, it is not shaped like a perfect circle. It is more of an oval, it is elliptical。
第二个信息:这个轨道形状会变。这里又用了5句话来反复解释,其中出现了一个稍微有些难度的单词consistent,而且防止有些考生不认识 这个词出题者又苦口婆心的给你解释了这个现象。有时候这个轨道形状圆点儿,有时候更椭圆点儿,更椭圆点儿的时候,地球更接近太阳。这里说的就是我们中学地 理知识中的近日点这个概念。
But the shape of this orbit isnt consistent; it varies over time, over a period of about a thousand years. Sometimes it is a little more circular, sometimes it is more elliptical. And when earths orbit is more elliptical, earth is actually closer to the sun during part of the year。
第三个信息:形状的变化会影响地球上冰川的形成。说话者再一次用了5句话来解释这个信息,并且怕你不知道这里要出考点,还用了反问句提醒你。
Which makes earth, and in particular, the northern hemisphere, warmer. And why is that important? Well, because most of the planets glaciers are in the northern hemisphere, and if it gets too warm, then glaciers will stop forming. And weve already talked about how that affects earths overall temperature。
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