parabolic sand dune

• 抛物线形沙丘

parabolic sand dune的用法和样例：

例句

1. The dark arc-shaped droplets of fine sand are called barchans, and are the interplanetary cousins of similar Earth-based sand forms.
   黑暗弧形细沙滴被称为新月形沙丘，类似于地球上的沙丘形式。