double [ˈdʌbl]

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n.两倍；adj.两倍的，双重的；v.加倍的，快步走，加倍努力

twice the size , amount , price , etc ., or consisting of two similar things together

They bought a double bed. 他们买了一张双人床。
Ten is the double of five. 10是5的两倍。