今年九月二十三日是秋分。秋分一过,来自南半球的暖湿空气逐渐减弱,来自西伯利亚一带的干冷气流渐渐加强。从秋分起,深秋季节就开始了。进入深秋以后,霜降频繁,气温日降,落叶纷飞。但是,山上的枫树、乌柏树、槭树、柿树、梨树、樱桃树却变得一片火红,生机勃勃,秋意盎然。面对这深秋景色,我们不期然而然地会想到晚唐著名诗人杜牧的名诗七绝《山行》。 September 23 this year is the autumnal equinox. After the autumnal equinox, warm and humid air from the southern hemisphere gradually weakened, dry and cold airflow from Siberia gradually strengthened. From autumn, the autumn season began. Into the late autumn, frost frequently, the temperature on the decline, falling leaves. However, the mountains of maples, Uber, maple, persimmon, pear, cherry trees have become a flaming, vibrant, vibrant. In the face of this late autumn scenery, we do not expect to come up with the famous poem Du Mu in the late Tang Dynasty.