Driving a car along the highway, gradually climbing up, if you discover that the tree leaves are mostly densely packed broad leaves, then you are still below 1,000 meters. If squeezed in among the leaves, there are long and sharp needles, then you are at about 1,500 meters, and it is a mixed deciduous-evergreen forest. If the trees all look like Christmas trees, then you are already above 2,000 meters.
搭車順著公路逐漸爬升，若發覺樹木葉片大而密的闊葉林，表示還在一千公尺高度以下；夾著樹葉變成長而尖的針葉林，則約在一千五百公尺左右，是闊、針葉混合林；若林相全為像聖誕樹般的針葉林，則標高已在二千公尺以上。