胡萝卜素形成黄色，另外还有花青素，使得夏季的末期和整个秋天都是一片红色和紫色的天地。

Underlying carotenoids give off a yellow hue, while anthocyanins, produced late in the summer and throughout fall, are responsible for the vibrant reds and purples.

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这位校长回到哈佛后，回到自己熟悉的工作环境，但感到换了另外一个天地：原来在这个位置上是一种象征，是一种荣誉。

After the President went back to Harvard, the once familiar working environment, he felt himself placed in a completely different world: this position proved to be a symbol, an honor.

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