And what was known about alpha particles at the time is that they were these charged particles and that they were very heavy.

当时对alpha粒子的理解,是它们是带电的而且非常重，有谁知道的,比Rutherford时代的多吗。

麻省理工公开课 - 化学原理课程节选

Does anyone know more than what Rutherford knew at the time, what alpha particles actually are?

知道alpha粒子是什么吗？,是的，很好，它们实际上是氦原子？

麻省理工公开课 - 化学原理课程节选