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According to most calculations, race walkers moving at a pace of six miles per hour would burn about 800 calories per hour, which is approximately twice as many as they would burn walking, although fewer than running, which would probably burn about 1,000 or more calories per hour. （2020全国I卷；阅读理解Text C·人与社会）
根据大多数的计算结果，以每小时6英里的速度竞走的运动员，每小时会消耗约800卡路里的热量，约是步行时消耗的两倍，尽管这比跑步要少，跑步每小时大概可以消耗1,000卡路里或以上的热量。
结构解码
难点突破
1.本句中race walkers后面的moving at a pace of six miles per hour是非谓语动词-ing的用法，用在名词后面作为后置定语，在分析句子时，容易将其误看作谓语部分。
2.第一个which引导的定语从句中，出现了twice as many as这个表示倍数的比较结构，A is twice as many as B意为“A是B的两倍”。
语法链接
倍数原级表示法
“A+谓语动词+倍数+as+形容词/副词原级+as+B”的结构表示“A是B的多少倍”，用法汇总如下：
1.比较的是可数名词的数量多少时，形容词用many，比如：After the new technique was introduced, the factory produced twice as many tractors in 2020 as the year before.引进新技术后，工厂在2020年生产的拖拉机数量是前一年的两倍。
2.比较的是不可数名词的数量多少时，形容词用much，比如：It cost three times as much as I had expected.它的花费是我预期的三倍。
3.比较什么就使用什么形容词，比如比较大小：The school is three times as big as theirs.这所学校是他们学校的三倍大。
4.如果要表达“是……的一半……”，使用half as +形容词+as，比如：Her room is half as big as yours.她的房间是你房间的一半大。
核心词
calculation n. [C]计算
race walker 竞走者
at a pace of 以……的速度
calorie n. [C]卡路里
approximately adv. 大约
burn v. 燃烧；消耗
probably adv. 大概，或许