我们在白杨树下野餐，看着它们的叶子在风中轻轻颤动。

We had a picnic under the ___aspen trees, watching their leaves tremble in the wind.

这把椅子是用白杨木制成的，非常轻便。

This chair is made of lightweight ___aspen wood.

阿斯本是一个以白杨树命名的美丽小镇，位于科罗拉多州。

___Aspen is a beautiful town named after the aspen tree, located in Colorado.