aspen
noun [ C ] uk/ˈæs.pən/ us/ˈæs.pən/
（欧洲）山杨;（北美）大齿杨
a tree of the poplar family, with leaves that shake even when there is only a little wind
On our walk along the river we passed thundering waterfalls and quivering aspens. 我们沿着河岸散步，一路经过了雷鸣般的瀑布和摇曳的山杨树。