英語時差:蟑螂對抗輻射: 誰是贏家？ -上

00:00

00:00

MP3下載 文本下載

https://online2.tingclass.net/lesson/shi0529/10000/10183/1043.mp3

https://image.tingclass.net/statics/js/2012

Well, they couldn’t survive the heat of a nuclear blast at ground zero, but their resistance to radiation may surprise you. In fact, most insects are much more resistant to ionizing radiation than mammals. Radiation is measured in units called Grays. Doses as low as three to six Grays were fatal to humans in Hiroshima and Chernobyl. By comparison, some adult cockroaches have survived doses up to nine-hundred Grays! That’s more than 150 times the lethal dose for humans!