可变性

例句：

1. 1. The weather can vary greatly from day to day.
   天气从一天到另一天可以有很大的变化。
2. 2. The population of the city has been increasing steadily over the past decade.
   过去十年里，这个城市的人口稳步增长。
3. 3. The company's strategy is flexible enough to adapt to changing market conditions.
   公司的战略规划足够灵活，以适应不断变化的市场条件。