a direct proportion的用法和样例：
- Outputting signal and discharge becomes a direct proportion relation.Measure distance breadth, the accuracy is high to wait a characteristics.
- The result indicates that the perforate value of a panel has a direct proportion to the Resin/wood ratio of the product.
- It is interesting to notice that there is a direct proportion between the F685/F735 ratio and the monomeric form /oligomeric form ratio of Chl-protein complexes.
- The desalting time was in a direct proportion with the inflowing water frequency, and the desalting time in the flood seasons was always shorter than that in the dry seasons.
- I'll book you on a direct flight to London.