mass ratio的用法和樣例：
例句
- To date, it has a rather poor power-to-weight ratio and is mechanically complex.
迄今為止，它有一個(gè)比較低的功率質(zhì)量比而且機械復雜。 - The positions of certain wavelengths in both cases depend on the proton-to-electron mass ratio.
他們發(fā)現，在這兩個(gè)觀(guān)測結果中，特定波長(cháng)的位置會(huì )隨著(zhù)質(zhì)子對電子的質(zhì)量比而改變。
