突减的

例句：

1. 1. The population of the city has suddenly dropped by 20%.
   该市的人口突然减少了20%。
2. 2. The temperature has decreased significantly since yesterday.
   自昨天以来，温度已经显著下降。
3. 3. The production of the factory has gradually diminished over the past few years.
   这家工厂的产量在过去几年里逐渐减少。