A dune is a hill of sand, built by the wind. You find dunes behind a beach, where grass tries to hold the sand still, and you find huge dunes in the desert, which slowly move.

A dune沙丘 is就是 built by the wind被風堆起來的 a hill of sand一座沙做的小山。You find dunes behind a beach你會在海灘後面看到沙丘，where grass tries to hold the sand still那裡的草試著讓沙子不要亂跑；and you find huge dunes in the desert你也會在沙漠裡看到巨大的沙丘，which slowly move它們會慢慢移動。

The shape is always on the move: wind takes sand from one side and drops it on the other, so a dune can walk, very slowly, across a road or a farm. People plant grass or put up fences to stop coastal dunes blowing inland.

The shape is always on the move這個形狀一直在移動：wind takes sand from one side風把沙子從一邊帶走 and drops it on the other丟到另一邊，so a dune can walk所以沙丘可以 very slowly非常慢地 across a road or a farm走過一條路或一片農地。People人們 plant grass or put up fences會種草或架柵欄，to stop coastal dunes blowing inland來阻止海邊的沙丘被吹向內陸。

The word is simple and physical; it is not a poetic extra for any hill.

The word這個字 is simple and physical很單純、很實體；it is not它不是 a poetic extra for any hill隨便一座山都能用的詩意說法。

A green hill in England is not a dune. A pile of snow is not a dune. It has to be sand, gathered by wind.

A green hill in England英國的一座綠色小山 is not a dune不是沙丘。A pile of snow一堆雪 is not a dune也不是沙丘。It has to be sand它必須是沙子，gathered by wind而且是被風聚集起來的。

There is a famous long book called Dune, set on a desert planet; that title is this same sand-hill word, stretched into a world.

There is a famous long book called Dune有一本有名的長篇小說叫《沙丘》，set on a desert planet故事設定在一顆沙漠行星上；that title is this same sand-hill word這個書名用的就是這個「沙做的小山」的字，stretched into a world被延伸成了一整個世界。