According to one classic theory, the reason is simply that there is more habitable space around the equator than at the poles. On the face of it, this seems to make sense.
据常规判断，赤道地带比两极有更多的栖息地，表面上看这个原因很是合理。
One of the two dates each year when at noon the Sun is directly overhead at the equator and day and night are of equal length.
一年中出现两次的日子，这一天中午太阳直射赤道，并且白天和晚上有相同时间长度。
One of the two dates each year when at noon the Sun is directly overhead at the equator and day and night are of equal length.
一年中出现两次的日子，这一天中午太阳直射赤道，并且白天和晚上有相同时间长度。
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