10是5的两倍。
十是五的二倍。
They multiply rapidly—some species double their biomass in as little as five hours.
硅藻繁殖迅速，有些硅藻物类仅5个小时就能让其生物量翻一番。
Last quarter, GDP growth dropped below double digits for the first time in five years.
上一季度，GDP增长5年来首次低于两位数。
John Smith, double room with bath from tonight for five day.
约翰·史密斯，双人房间，带浴室，今晚起五天。
On their current trajectory, they will double in the next five years.
以目前的迹象，在下个五年会翻一番。
His debt is double what it was five years ago.
他的债务是五年前的两倍。
It has five gates, each with double portals.
州城周围可二十里，有五门，门各两重。
It has five gates, each with double portals.
州城周围可二十里，有五门，门各两重。
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