Researchers say that regular exercise reduces the risk of getting a cold -- but only if it is not too vigorous, the Daily Mail reported.
据英国《每日邮报》报道，研究人员表示，日常锻炼若不是太剧烈，可预防感冒。

Brisk walks every day can reduce your chance of catching a cold by up to 30 percent.
每天快步走可使感冒几率降低30%。
But prolonged strenuous activity could make you between two and six times more likely to succumb to upper respiratory infections.
但运动时间太久、强度太大，上呼吸道感染概率则要扩大两到六倍。
Professor Mike Gleeson, an expert in biochemistry at Loughborough University, concluded from examining the last 10 years of research in this area that moderate exertion is best for the immune system.
来自拉夫堡大学的生化学专家迈克·格里森教授，基于其在该领域过去十年的研究得出：适度运动最有利于免疫系统发挥作用。