If you have further questions, please contact the people listed on the last page of the report.
如果你还有问题的话,请和报告最后一页名单上的人员联系。
It is the natural frequency of emission of the hydrogen atoms in space and was discovered by us in 1951;
这个频率是空间氢原子释放的自然频率,是在1951年被人类发现的。