"By all means" is more gracious. It's like saying "certainly, absolutely, most definitely you may". "Yes, you may" simply grants permission. You can make it more gracious by adding an embellishment, such as "Yes, please, certainly you may".
2023년 3월 2일
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Yes it is stronger, more emphatic.
"Can I make a suggestion?"
Yes, of course!
By all means!
2023년 3월 1일
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Great question. And, in short, yes...kind of
"I need you to complete the project by Friday, at all costs / ny all means NECESSARY"
Note the word 'necessary'. "At all costs" obviously means...no matter what money you need/no matter what the consequences.
"By all means necessary" means...whatever methods you need.
2023년 3월 1일
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초대받은 사람
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Exactly what Jonathan has explained, both "by all means" and "you may" grant permission however "by all means" is a lot more enthusiastic and encouraging.