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重点讲解：
1. break down （使）（物质）分解；
Sugar and starch are broken down in the stomach.
糖和淀粉在胃里被分解。
2. liken to 把…比作；把…比拟为；
She likens marriage to slavery.
她把婚姻比作奴役。
3. take the place of 代替；取代；
Optimism was gradually taking the place of pessimism.
乐观情绪逐渐取代了悲观主义。
4. take in (人、动物或植物)摄入，吸收；
They will certainly need to take in plenty of liquid.
它们当然需要吸收大量液体。
