0 The phrase 'one of the' is used to describe something/someone from the same group. There are many birds on the tree. One of the birds is red. This means we are talking about all the birds on the three but then when you want to be specific about the red bird, you use one of the. He is one of the soldiers who fights for their country - is correct.
The 'one hand' could be any generic hand (no article) or a specific one (definite article). 'The other' refers to the 'matching hand' of the first one. There can only ever be one, and it is being referred to explicitly as the partner of the first, therefore it needs a definite article.
When using the word " which " is it necessary to still use " one " after asking a question or do " which " and " which one " have the same meaning? Where do you draw the line on the difference between " which " and " which one " when asking a question that involves more than one answer?
The Hollywood Reporter on MSN: Dune: Part Three: New Footage With Timothée Chalamet, Zendaya Revealed
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Dune: Part Three Is Being Called A Conclusion – What About The Other Four Books?