a sand dune的用法和样例：
- Climbing a sand dune on the way home.
- The layer surface was of a wavy structure, probably due to the place being a sand dune during ancient times.
- The towering ridge of a sand dune in the Arabian Desert points to the afternoon sun.
- Another striking example, “Cross-border marriage is as dreamily beautiful as in a fairytale, but is often based on romantic imagination or on a sand dune.
- We have over a sand dune belt, whether tracked or wheeled armored vehicles are difficult to travel above, this is the best defense workers in advance of the natural barriers.
a sand dune的相关资料：