There has been a decrease in imports.

进口量有所减少。

There has been a decrease of nearly 6% in the number of visitors to the museum.

参观博物馆的人数下降近6%。

The number of new students decreased from 210 to 160 this year.

今年新生的数量从210人减少到160人。

The price of wheat decreased by 15% last year.

去年小麦的价格下降了15%。

People planted trees on the waste hills to decrease water and soil loss.

人们在荒丘上种植了树木，以减少水土流失。