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Definition: numbers from 0 to 9/numbers from 10 to 99, etc. Level: C2
我不知道投诉的确切数量，但肯定在两位数。
I don't know the exact number of complaints, but they are certainly in ___double ___figures.
失业率多年来首次降至个位数。
The unemployment rate has dropped to ___single ___figures for the first time in years.
慈善活动的捐款数额达到两位数，超出了所有预期。
The charity event attracted donations in ___double ___figures, exceeding all expectations.