proton-to-electron-mass ratio

例句：

1. 1. Themeasurement of this ratio is crucial for understanding the structure of matter.
   测量这个比例对于理解物质的结构至关重要。
2. 2. The scientists found that the ratio was consistent with the predictions of quantum mechanics.
   科学家们发现这个比例与量子力学的预测一致。
3. 3. The discovery of this ratio has led to new theories about the nature of space and time.
   这一发现的比率导致了关于空间和时间本质的新理论的产生。