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标题:Do We Age Steadily, or in Bursts?

正文：For many people, aging feels like it happens in stops and starts. After a period of smooth sailing, one day, seemingly out of the blue, you have achy knees. “You wake up in the morning and you suddenly feel old,” said Dr. Steve Hoffmann, a computational biology professor at the Leibniz Institute on Aging in Jena, Germany. “That’s sort of the takeaway.” It turns out there may be a scientific basis for this experience. By analyzing age-related markers, such as proteins and DNA tags in the bloodstream, some scientists are coming to understand that aging in adulthood is not a linear process, but perhaps one that jumps dramatically at certain points in one’s life.

知识点：in stops and starts /ɪn stɒps ənd stɑːts/
Irregularly; with periods of stopping and starting.断断续续地；时停时续地
• The project progressed in stops and starts due to funding issues.由于资金问题，这个项目时断时续地进行着。

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