来自180多个国家近5000名代表通过三天时间讨论了怎样减轻因飞涨的粮价而带来的苦难。

Nearly 5,000 representatives from more than 180 countries spent three days discussing how to ease the suffering caused by soaring food prices.

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方法：低肢体活动力通过三天以上对45名中到中度COPD患者的腿部活动记录检查来完成，对照组为年龄相近的18人。

Methods: Lower limb activity was measured by leg actigraphy over 3 days in 45 patients with moderate to severe COPD and 18 controls of similar age.

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我们每三到四天查看一次培养物，并通过添加捐献者的淋巴细胞使感染病毒的细胞存活了三周。

We checked the culture every three to four days and managed to keep the virus-infected cells alive for three weeks by adding lymphocytes from donors.

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