1. Only the wolf stayed with him hour after hour. At last he could go no further.
    只有那条狼连续几个小时一直跟着他。最后他实在挪不动了，

2. One of the best answers he's ever received came from an 86-year-old man who learned the ancient Chinese exercise form of tai chi as part of Wolf's study of how exercise can help seniors prevent falls.
    他得到的最佳答案之一来自一位86岁的老人。沃尔夫研究的是运动如何帮助老年人防止摔跤，而作为该研究的一部分，这位老人修习一种古老的中国健身法——太极。

3. In Wolf's study, published in May 1996, 215 seniors aged 70 to 96 were divided into three groups.
    在沃尔夫1996年5月发表的研究中，215名70至96岁的老人被分成三组。