With constant selection and improvement of feed conversion ratios, feed intakeitself tends to be reduced over time.
随着不断变化的选择和饲料转化的改善，饲料采食量本身随着时间趋向下降。
2
The conversion efficiency between the fundamental wave and the th emission is roughly constant over the length of the plasma channels.
实验研究发现三次谐波的转换效率在通道范围内基本保持不变。
3
This paper introduces a new method for implementing the long time constant in the circuits of automation, apparatus, signal conversion, collecting and processing of sensor's signal, etc.