解释：大部分药材都以新鲜为好，但艾草却以陈年的为佳，体现了药材使用的特殊性。

The future of food depends on how we treat our soil today.

It really matters whether people are working on generating clean energy or improving transportation or making the Internet work better and all those things. And small groups of people can have a really huge impact.

The art of filmmaking is in the details; it's the small things that make a big difference.

Choose always the way that seems the best, however it may be; custom will soon render it easy and agreeable.