Which scientist discovered that objects in water are lifted up by a force that helps them float这句话中的两个 that 的含义和区别

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Which scientist discovered that objects in water are lifted up by a force that helps them float这句话中的两个 that 的含义和区别

Which scientist discovered that objects in water are lifted up by a force that helps them float这句话中的两个 that 的含义和区别
Which scientist discovered that objects in water are lifted up by a force that helps them float
这句话中的两个 that 的含义和区别

Which scientist discovered that objects in water are lifted up by a force that helps them float这句话中的两个 that 的含义和区别
语法上,第一个是宾语从句的关联词,第二个是定语从句中的关联词.
意义上,第一个无实义,就是分开主句和宾语从句,表示“discover”的内容.第二个that引导的定语从句修饰"a force",相当于“the force”.

谁发明了浮力?
Archimedes(阿基米德)