拉基夫.格罗弗认同紧张和压抑是导致衰老的关键因素。
Rajiv Grover agrees that stress and depression are key factors in ageing.
他改造麦蒂的身体，没有核心竞争力时，他一到格罗弗的健身房。
He reinvented McGrady's body, which had no core strength when he got to Grover's gym.
不过罗利市北卡罗莱纳州立大学的工程学教授拉里·西尔弗伯格认为，如果圣诞老人已经学会时空冲浪的话，他或许还是得担心这一点。
Or perhaps he does, if he has learned to surf the waves of space-time, believes Larry Silverberg, an engineering professor at North Carolina State University in Raleigh.
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