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重点讲解：
1. date back 追溯（到）；开始（于）；始造（或建）（于）；
The mastery and skills of cooking in China date back thousands of years.
中国在烹饪方面的优势和技艺可以追溯到几千年前。
2. transform into 转换；改变；改造；
Your metabolic rate is the speed at which your body transforms food into energy.
新陈代谢率是身体把食物转换为能量的速度。
3. take for granted 认为…是理所当然的；
Mary took it for granted that they would approve of the idea.
玛丽想当然地认为他们一定会同意这个想法。
4. rely on 依赖；依靠；
Once customers come to rely on these systems they almost never take their business elsewhere.
顾客一旦依赖上这些系统，几乎就不会光顾其他商家。
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