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Riverside have found that some of an elderly mouse’s liver g

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Riverside have found that some of an elderly mouse’s liver genes can be made to behave as they did when the mouse was young simply by limiting its food for four weeks.
1 理解:其中“as”怎么讲?
2 这句怎么理解:can be made to behave as they did
Riverside have found that some of an elderly mouse’s liver g
some of an elderly mouse’s liver genes can be made to behave as 仅仅通过限制年老老鼠四个星期的食物,可以使年老老鼠的一些肝脏基因像它年轻