When we think about the long process of our English study and the level of our mastery of this language that we have reached, we should say that the input and output ratio is too low.
想想我们学习英语的漫漫之路和我们对英语掌握的程度，应该说我们的投入与产出比太低了。
The decoder determines the optimum conversion ratio to improve the efficiency of system from the relation between the input and output voltage.
首先采用译码器对输入和输出电压进行判比，确定最优的转换系数，提高了系统的效率。
Respectively calculate different sizes and U-value of window's structure of different opening style to be an ideal basis for choosing the best input-output ratio.
分别计算不同尺寸及开启方式的窗结构U值，作为选择最佳投入产出比率的理想依据。
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