They used artificial intelligence to take a deep look at precipitation data in Japan over a period of 38 years.
彼らは人工知能を用いました、日本の降雨データを詳しく調べるために、38年間にわたる。
The study showed that the frequency of extreme rainfall events more than doubled in that time. It reached more than 12 days in 2015. That was up from six days in 1977.