Asking for explanation : I’m sorry, I’m not sure I understand. , I don’t know what you mean/that means. , What is that (exactly)? , What does HD stand for? , Can you explain …? , Could you tell me what that is/does/means? , What do you mean (by …)?, Giving explanation : It’s a/the kind/type/sort of … , It means … , It stands for High Defi nition. , It helps you to/lets you,

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