英语听力 学英语,练听力,上听力课堂! 注册 登录
> 在线听力 > 英语中级听力 > Breaking News 边听边练 2020 >  第93课

BreakingNews·200706-Scientists change how we calculate dog years

所属教程:Breaking News 边听边练 2020

浏览:

qinting

2021年07月22日

手机版
扫描二维码方便学习和分享
https://online2.tingclass.net/lesson/shi0529/10000/10339/200706.mp3
https://image.tingclass.net/statics/js/2012

Scientists change how we calculate dog years

For decades, dog lovers have been incorrectly calculating the age of their pet pooches. People have traditionally worked out their dog's age in "human years" by multiplying by seven. However, researchers at the University of California San Diego School of Medicine in the USA have come up with a new formula. They say it more precisely determines canine age. Their new method requires a little more than simple mental arithmetic to work out a dog's age. It involves a comparison of the genomes of dogs and humans. Scientists had to analyse how DNA changes as humans and dogs age. The scientists regard such DNA analysis as the best way to measure the ageing speed of mammals.

The researchers analysed blood samples from 105 Labrador retrievers. After a bit of number crunching, they created a graph to show the different rates at which canines and humans age. They said a one-year-old dog is similar to a 30-year-old human, while a four-year-old hound is comparable to a 52-year-old person. Researcher Trey Ideker said by the time a dog reaches seven years old, its ageing slows. He said: "This makes sense. When you think about it, a nine-month-old dog can have puppies, so we already knew that the 1:7 ratio wasn't an accurate measure of age." The researchers said their new formula doesn't fully address the fact that different breeds of dog age at different speeds.

用手机学英语,请加听力课堂微信公众号:tingclass123
用户搜索

疯狂英语 英语语法 新概念英语 走遍美国 四级听力 英语音标 英语入门 发音 美语 四级 新东方 七年级 赖世雄 zero是什么意思重庆市远洋高尔夫国际社区英语学习交流群

  • 频道推荐
  • |
  • 全站推荐
  • 广播听力
  • |
  • 推荐下载
  • 网站推荐