1.
how many (flat objects)
question word used with the counter 枚 to ask about the quantity of flat, thin objects such as paper, photos, clothes, plates, CDs, etc.
Related Words
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何冊 (how many (books))
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何杯 (how many (cups))
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一枚 (one (flat object))
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何個 (how many)
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何回 (how many times)