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| 21. | "a Chinese flute made of animal bone about 8000 years ago and unearthed in May 1987, show that there |
| "1987年中国出土的一支约8,000年前的骨笛证明那时就有了音乐和乐器。" |
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| 22. | Enzymes are harvested from fermentations, or from plant or animal products. about 3000 have been at least |
| 酶是从发酵，或者从动植物产品得到的。至少可以部分表达的酶大约有3000种。与常规催化剂比，酶催化剂的优点是有高的选择性。 |
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| 23. | researching content of eco-nutrition and, in particular, the instruction guidance of ecology fundamentals about |
| 本文论述了动物营养学与生态学的关系、态营养的概念以及研究内容;着重论述了可持续发展应遵循的生态学基本原理对动物营养学的指导作用。 |
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