Lutein is dihydroxy - carotenoids with the ionone ring systems distributed widely in nature.叶黄素是含紫罗酮环的二 羟基 类胡萝卜素,在自然界广泛存在.Lutein and zeaxanthin are both dihydroxy - carotenoids with the ionone ring systems distributed wi...
The best thing to do when entering unknown territory is smile.踏入未知地带最好的对策就是微笑。The most amazing thing about nature is its infinite variety.大自然最让人惊叹的是它的无限多样性。He hadn't eaten a thing except for one forkful of salad.除了一...