By contrast, the large zebra lives on the masses of low-quality stem material.
相比之下，大型斑马依靠大量的低质量茎材料为生。
2
His survey also found that the "quality" of the people of Shanghai, meaning the median level of their education, etiquette and professional lives, is surprisingly low.
他的这项调查还表明上海人的“素质”，即他们的教育、礼仪和职场生活水平都出人意料的低。
3
For more than a decade, scientists have known that a low-calorie diet lengthens the lives of many organisms, including yeast, fruit flies, monkeys, and perhaps humans.