多年的干旱和过度耕种使这片地区变成了一个尘土飞扬的不毛之地。

Years of drought and over-farming turned this region into a ___dustbowl.

20世纪30年代，由于长期干旱，美国中西部地区变成了一个巨大的沙尘暴频发区。

In the 1930s, the Midwest of the US became a massive ___dustbowl due to prolonged drought.