It was the tip of a saddle protruding from beneath a sand drift.

这是从流沙层里露出来的马鞍的尖部。

youdao

So, it can be concluded that sand drift activity and aeolian landform forming are mainly taking place in warm dry period.

可见，区内风沙活动及风成景观的塑造过程，主要是在暖干期进行的。

youdao

As a kind of special soil, aeolian sandy soil mainly lies in arid and semiarid areas where sand drift activity is very strong.

沙土是存在于干旱、半干旱地区的一种特殊性土，其岩土工程性质与风沙环境紧密相关。

youdao

Two days earlier, it had scooped some sand from a drift, sieved it to a fineness of less than a hundred and fifty microns, and dropped a portion half the size of a baby aspirin into a funnel on its back.

NEWYORKER: The Martian Chroniclers

" Red residue clinging to the scoop walls is from a sample collected earlier from a drift of windblown dust and sand called "Rocknest.

FORBES: First Curiosity Drilling Sample in the Scoop