Leaves a positive acceptance of sunlight every day, and more will be green, opposite leaves loose cell row, the gap, and less chlorophyll, the leaf color in a negative light.

• 叶子正面每天都接受阳光照射多也就绿，叶子反面细胞排的比较松散，空隙大，叶绿素也少，所以叶子反面的颜色比较浅。