过去式和过去分词都是ripened，中文意思是vt. 使成熟vi. 成熟
例句：
The corn ripens in the sun.
农作物在阳光下成熟。
The sun ripens the corn.
阳光使农作物成熟。
Fruit sweetens as it ripens.
水果成熟後就好吃了。
Time had ripened his life and mellowed its fruits.
时间使他的生命成熟，结出硕果。
