vi.

1. 減；減少，減小[（+in/to）]
   Car sales are decreasing.

   汽車銷售量下跌。

vt.

1. 減；減少，減小[（+to）]
   These measures will help decrease the cost of production.

   這些措施有助於降低生產成本。

   They are making every effort to decrease the production cost.

   他們正盡力減少生產成本。

n.

1. 減少，減小[C][U][（+in/of）]
   There has been a decrease in our imports.

   我們的進口減少了。

2. 減少額，減小量[C][（+in/of）]
   The decrease in unemployment was 30 percent.

   失業人數減少了百分之三十。

v.

n.