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1·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.

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。

2·Chlorogenic acid, also a phenolic compound, is a minor constituent in tea.

同属酚类化合物的绿原酸在茶叶中是次要成分。

3·Carbon dioxide is a minor but important constituent of the atmosphere, averaging about 0.03% or 300 PPM by volume.

二氧化碳是空气的含量较小但很重要的组成成分，体积比平均约为0.03%或300ppm。