They studied 200 patients with an average age of 60 and discovered that those on a low dose had double the reduction in knee pain of patients on higher doses.

他们研究了平均年龄为60岁的200名患者，发现在减少膝盖疼痛的效果上，那些少量服用鱼油的病患是大量服用的病患的两倍。

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With friends, sharing the pain is half the pain, to share the joy of double happiness.

与朋友在一起，分担的痛苦是减半的痛苦，分享的快乐是加倍的快乐。

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Objective This paper introduces an improved pneumo barium double contrast examination (for the upper gastrointestinal tract) to release the pain caused by gastrointestinal series.

目的：为了减轻患者检查时的痛苦，对气钡双对比造影（上胃肠道）方法作了改进。

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If there's a recession, the pain will double.

FORBES: Bigger, Faster And, Yeah, They Burn More Gas

Here he is describing the pain of being a double amputee.

NPR: 'Pulled from the Rubble '

They end up bent double, on zimmer frames, with pain, particularly pelvic fractures which are almost impossible to control in terms of pain.

BBC: Breakfast with Frost