focal ratio

同根派生

The baker Super-Schmidt camera can operate with extremely low focal ratios.
Baker超施密特照相機則能以非常低的焦比工作。
If you notice, every manufacturer of quality scopes with fast focal ratios uses mirror diagonals.
如果你注意一些，沒一個生產高質量短焦比的廠家，都會使用反射結構的天頂；
In the situation of different energy input, models are calculated.The thermoelectric generating parameters are obtained with the changes of focalizing ratio.
并對不同輸入能量的情況進行了計算，得出了熱電性能參數(shù)隨聚光比的變化規(guī)律。
The focal point of our discussion was the need for action.
我們討論的中心是采取行動的必要性。
The ratio of students to teachers is 35:1.
學生和老師的比率是三十五比一。