Green is an important colour. But "green" is more than just a colour. It is the colour of grass and leaves. It is also the colour of most growing plants(植物).
Sometimes, the word "green" means young and growing. It is something that is not ripe(成熟). A cow has no horn(角). "A green hand" means you come to a new job(工作).
Sometimes, the word "green" means good. The meaning of a "green thumb(拇指)" is that you may have a magic way to make plants grow quickly and well.
Green has another wonderful meaning. You often takc a bus to go out, but not take a car. We say you are going green. Because you love the world in a better way.
