gradually increased the cultivation area

例句：

1. 1.He gradually improved his English skills.
   他逐渐提高了他的英语技能。
2. 2. The weather gradually warmed up as the day went on.
   随着时间的流逝，天气逐渐变暖。
3. 3.She gradually realized that she was wrong about her assumptions.
   她逐渐意识到她对假设的误解是错误的。