四季分明的天气,就是有春夏秋冬,冷热分明,会烈日高照也会满天飞雪.Because not every place has the four seasons-spring,summer,autumn and winter,such as in Africa or South Pole.确定？完全是我个人的理解，英语你看懂了吗？就是：因为不是每个地方都有四个季节——春、夏、秋、冬，比如非洲或南极。所以才会有这种加了连字符的词。好吧懂了