These are the same meaning: Some people are hard to satisfy. = To satisfy the some people is hard for the men to do that. The mountain is hard to climb.
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bepleasedI say [Some people are hard to satisfy.] is equal to (It is hard for the men to want to satisfy the some people.) and (To satisfy the some people is hard for the men to do that.)
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In the original sentence --[Some people are hard to satisfy.], "be hard" is a judgment made from the men to satisy them and doesn't show that 'be hard' has an influence with