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1·Biscuits and crackers are chemically leavened.

饼干和脆饼干是用化学方法发酵的。

2·This addition of a chemically precipitated substance into pore spaces is termed permineralization.

这种化学沉淀物质进入孔隙的过程被称为“完全矿化”。

3·But when we analyze these cells chemically, we find something very interesting, a chemical in them, an enzyme called telomerase.

但当我们用化学方法分析这些细胞时，我们发现了一些非常有趣的东西，其中有一种化学物质，是一种叫做端粒酶的酶。

4·The calotype was revolutionary in its use of chemically treated paper in which areas hit by light became dark in tone, producing a negative image.

卡罗摄影法对化学处理纸的使用是革命性的，其中光照区域色调变暗，形成负像。

5·It must also be appreciated that many important new bio-products will still be synthesized chemically from models derived from existing biological molecules.

还必须认识到，许多重要的新生物产品仍将从现有生物分子衍生的模型化学合成。

6·By chemically extracting nickel form the ash, they produced 100 pounds of nickel per acre of land at a total cost per pound slightly above that of current mining.

通过化学方法从灰烬中提取镍，他们每英亩土地生产了100磅镍，每磅的总成本略高于目前的采矿成本。

7·Agronomists studying the herb have discovered that it produces large amounts of histidine, an amino acid that, in test-tube solutions, renders these metals chemically inert.

研究这种药草的农学家发现，它会产生大量的组氨酸，这种氨基酸在试管溶液中会使这些金属具有化学惰性。

8·The raw sewage is chemically treated.

未经处理的污水要进行化学处理。《牛津词典》

9·The meat is chemically treated to extend shelf life.

猪肉经过化学处理以延长保存期。《柯林斯英汉双解大词典》

10·Matter (物质) is always changing, either physically or chemically.

无论从物理还是化学的角度来看，物质都是不断变化的。