5克镭对1930年前后进行的实验的成功作出了决定性的贡献。
5 grams of radium made a decisive contribution to the success of the experiments undertaken in the years around 1930.
存在于巴黎镭研究所的1.5克镭的库存对在大概1930年进行的实验的成功作出了决定性的贡献。
The existence in Paris at the Radium Institute of a stock of 1.5 grams of radium made a decisive contribution to the success of the experiments undertaken in the years around 1930.
作者对其的解释和外推并未经过任何决定性的实验，而且他们能否这么做也未可知。
The authors’ interpretations and extrapolations of it have not been subjected to any decisive tests, and it is not clear that they ever could be.
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