中譯英...........please

How big is the capacity of human beings' memory?

What is the capacity of a human's memory?

Human memory is?

人類的記憶容量是多少?

> How much memory capacity does a human have?

> How much memory capacity does a human being have?

please note: you do NOT use *how many* as *memory capacity* is uncountable.
- for uncountable subjects, you use *how much*.

人類的記憶容量是多少?

How many is humanity's memory capacity?

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What is the maximum capacity of human memorizing cell ?

Human memory volume is?