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In English, we say "write down" to mean "to put something into writing, typically in a clear and orderly way." This phrase likely comes from the physical act of writing on a piece of paper or other surface. Here are some examples of how this phrase can be used in a sentence:Can you please write down the address so I don't forget it?
I need to write down this idea before I forget it.
Can you write down your phone number so I can call you later?
I always write down my to-do list so I can keep track of what I need to do.
In general, "write down" is a very common phrase in English and is used in many different contexts. It is often used to make sure information is recorded accurately, either for personal use or for others to read later.
来源：作文地带整理
