Farmers and gardeners have long used greenhouses to extend the growing season in cold weather.

VOA: special.2009.12.22

Spending 20 minutes walking allows me to be in contact with what is season like, and what is the day-to-day change and the weather.

每天花上二十分钟走路，这让我,感受到了每个季节的不同，也感受到了每天的变化和每日的天气。

普林斯顿公开课 - 人性课程节选