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上期划线句答案
With a radius of around one thousandth of a millimeter, the fluorescent polystyrene microspheres can technically be categorized as 'nanoplastics', but the authors decided not to differentiate these from larger microplastics in light of ongoing debates around the size limits of these particles.
（实验所用）荧光聚苯乙烯微球的半径大约为千分之一毫米，技术上可以归类为“纳米塑料”。然而，鉴于学界对于微塑料颗粒尺寸界限持续存在争议，作者决定不将其与较大的微塑料进行区分。
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本期内容
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双语阅读
Para.1
A new study gives all of us some extra motivation when it comes to getting outside and exercising: every day you manage to fit in an additional one-hour walk, you could be boosting your lifespan by an extra six hours. That's the approximate benefit if you're currently in the 25 percent least active people in the US, according to fitness tracker data crunched by a team led by researchers from Griffith University in Australia.
Para.2
If you're in the top 25 percent, an extra walk isn't as much of a boost – you've already received most of the health benefits from exercise – but the study also highlights and quantifies some of the key benefits of an active life. The team analyzed wearable activity data from the National Health and Nutritional Examination Survey (NHANES) in the US, which recruits 5,000 volunteers a year.
Para.3
To calculate how changes in activity levels can influence mortality risk, researchers referenced the NHANES results against a life-table model (where mortality rates are tracked at specific age points) and previous research into exercise and lifespan.
Para.4
The team is keen to raise awareness about how many health benefits come with additional exercise – and moving your way up between the quartiles may be more achievable than you think, even from the lowest to the highest. "This is not an unreasonable prospect, as 25 percent of the population is already doing it," says Lennert Veerman, a professor of public health at Griffith University. "It can be any type of exercise [to reach that top quartile] but would roughly be the equivalent of just under three hours of walking per day."
Para.5
Suggesting that exercise leads to a longer life is nothing new, but quantifying and simplifying the benefits can grab attention – whether it's five minutes a day to reduce blood pressure or nine seconds a week to grow muscle. Now there's a new target to aim for: an extra hour's walk a day. If you find that too daunting a prospect, remember that any amount of exercise makes a difference to health and well-being.
本文节选自：Science Alert
发布时间：2024.12.26
作者：David Nield
原文标题：A Single One-Hour Daily Walk Could Add Six Hours to Your Lifespan
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写作句总结
原句：To calculate how changes in activity levels can influence mortality risk, researchers referenced the NHANES results against a life-table model (where mortality rates are tracked at specific age points) and previous research into exercise and lifespan.
结构：To calculate how X can influence Y, researchers referenced A against B and C.
例句：To evaluate how access to education can influence career prospects, researchers referenced national survey data against historical employment trends and relevant academic studies.
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阅读理解题
According to the study, what is the approximate equivalent of exercise needed to reach the top 25% of activity levels?
A. One hour of walking per day
B. Just under three hours of walking per day
C. Six hours of walking per day
D. Nine hours of walking per day
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全文概括
A new study using U.S. fitness tracker data reveals that increasing daily physical activity, specifically adding an hour of walking, can significantly extend lifespan, particularly for the least active individuals. Researchers quantified this benefit, showing a potential six-hour increase in lifespan for those in the bottom 25% of activity levels. While the benefit lessens for the most active, the study emphasizes the considerable health advantages of increased exercise. The findings are based on a large dataset and a life-table model, aiming to encourage people to increase their activity levels, even incrementally. The study highlights that even small increases in exercise provide substantial health benefits.
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