"break down"
Does this verb means "explain" in any context?
I'd appreciate some example phrases. 是什麼意思

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Yes, it means explaining something complicated by separating it into component pieces, explaining the pieces, then putting it all together. For example: A teacher might say, “Calculating current flow in a series/parallel network is complicated. Let me break it down for you. First we calculate the impedance in this part of the network by using this formula, then we calculate this, then we calculate that. So now you have the total impedance. Using the known power source voltage you can now calculate the current flow.” Or a policeman might say,”Joe, we know you killed Sam and we have the evidence to prove it. Let me break it down for you. Your fingerprints are on the murder weapon. His blood is on your clothes. We have surveillance video of you running from his house. Put that all together and it means you are going to jail for a long time.”