Orange and yellow foods such as carrots, sweet potatoes and yellow peppers get their color from carotenoids, compounds that boost the immune system.

橙色和黄色的食物身上的颜色，如胡萝卜，红薯和黄色辣椒都来自于类胡萝卜素，一种能增强免疫系统功能的化合物。

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Carotenoids are commonly found in fruit and vegetables such as yellow and red peppers, spinach, apricots and melons.

在红色或黄色的辣椒、菠菜、杏、瓜等果蔬中类胡萝卜素含量较高。

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On the other hand, I found perfectly good red, orange, and yellow sweet peppers at 50 cents each, which knocked my socks off.

某一次，我却发现了一些又好又甜的红色、橙色以及黄色辣椒，只要50美分一只，确实让人大跌眼镜。

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In honor of President Obama they will be serving a Chicago Hot Dog cart with Vienna beef hot dogs, Kosher pickles, celery salt, yellow mustard, sport peppers, neon relish, diced onions, fresh tomatoes, and steamed poppy seed bun.

FORBES: Create Your Own Culinary Presidential Inauguration

Whether it's unusual heirloom tomatoes, such as Aunt Ruby's German Green or Yellow Pear, or purple-leaved Black Pearl peppers, which were introduced by the U.S. National Arboretum in 2006, interesting-looking vegetable varieties are more widely available.

WSJ: Who Put Lettuce in My Daffodils?