動(dòng)詞 decrease:

1. decrease in size, extent, or range
   同義詞：decrease, diminish, lessen, fall
2. make smaller
   同義詞：decrease, lessen, minify

形容詞 decreasing:

1. becoming less or smaller
2. music

1. Student numbers have decreased by 500.
   學(xué)生人數(shù)減少了500名。
2. Our sales are decreasing.
   我們的銷(xiāo)售量在減少。
3. An electromagnetic wave of audio frequency produced by atmospheric disturbances such as lightning, having a characteristically decreasing frequency responsible for a whistling sound of descending pitch in detection equipment.
   嘯聲干擾一種由于諸如閃電等大氣干擾而產(chǎn)生的音頻電磁波，具有典型的逐漸減弱頻率的特征，該頻減引起了檢波設(shè)備中調(diào)逐漸下降的嘯聲
4. Toy sales peaked just before Christmas and are now decreasing.
   玩具銷(xiāo)售額在圣誕節(jié)前夕達(dá)到最高峰，現(xiàn)已逐漸下降。
5. Interest in the sport is decreasing.
   人們對(duì)此項(xiàng)運(yùn)動(dòng)的興趣已逐漸淡薄。