尽管它的视觉效果如此显著，但尘埃只是位于恒星之间的物质的一个次要组成部分，其密度极低。
Although its visual effect is so pronounced, dust is only a minor constituent of the material, extremely low in density, that lies between the stars.
研究表明，在周期注水改善开发效果中，各种力所起的作用大小不同，毛管力的作用是主要的，弹性力的作用是次要的，重力基本不起作用。
This study shows that for improving development effect in the cyclic flooding, order of roles played by various forces are: capillary force, elastic force, while gravity plays no part in it basically.
实验表明，侵染部位对转化效果的影响最大，而菌液浓度、侵染时间是影响转化的次要因素。
Experiments show that part of the infection transformation effect the most influence, and microbial concentration, infection time is the transformation of the secondary factors influence.
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