Groves of elderly aspen tremble in the wind , but no sprouts push up in the understory 年老的白杨树丛在风中颤动，下层植被却没有新树苗生长。
2.
Giant pandas live in broadleaf and coniferous forests with a dense understory of bamboo , at elevations between 5 , 000 and 10 , 000 feet 大熊猫生活在长有茂密箭竹的阔叶与针叶混交林里，海拔在5 , 000和10 , 000英尺之间。
3.
Climatological data from fossil pollen , leaves and wood indicate that the cretaceous forests of northern alaska consisted of a mixed canopy that included deciduous conifers with an understory of flowering plants , ferns and cycads 由花粉、叶子和木材化石?集到的气候资料显示，阿拉斯加北部的白垩纪森林有混合型林冠，包括了落叶针叶林以及林下的开花植物、蕨类和苏铁。
