focal ratio

同根派生

The baker Super-Schmidt camera can operate with extremely low focal ratios.
Baker超施密特照相机则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，没一个生产高质量短焦比的厂家，都会使用反射结构的天顶；
In the situation of different energy input, models are calculated.The thermoelectric generating parameters are obtained with the changes of focalizing ratio.
并对不同输入能量的情况进行了计算，得出了热电性能参数随聚光比的变化规律。
The focal point of our discussion was the need for action.
我们讨论的中心是采取行动的必要性。
The ratio of students to teachers is 35:1.
学生和老师的比率是三十五比一。