tripled [ˈtripld]

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附加级

v.（使）增至三倍( triple的过去式和过去分词 )

The enemy tripled his strength. 敌军把兵力增加到原来的三倍。来自《简明英汉词典》
He tripled his income. 他使他的收入增加两倍[增至三倍]。来自《现代英汉综合大词典》