I would like here to recall the extraordinary development of radioactivity, this new science which had its origin, less then forty years ago in the work of Henri Becquerel and of Pierre and Marie Curie.

• 我想在这里回顾一下放射性研究的非同一般的发展情况；这一新兴学科起源于三十多年前贝克勒尔和居里夫妇的研究工作。