1. Caffeine is the active constituent of drinks such as tea and coffee. 咖啡因是茶和咖啡这类饮品的活性成分。
2. Over time, the protein in the eggshell breaks down into its constituent amino acids. 随着时间的推移,蛋壳中的蛋白质分解成其构成成分氨基酸。
3. That's because the red light is actually not a gross constituent unit in a semiotic system, right? 那是因为红灯不是这一符号系统的一个主要组成单元，对吗？
4. He was interested in individual differences, not just in the overall volume of flatus, but in the differing percentages of constituent gases. 他感兴趣的是个体差异，不仅对肠胃气的总量感兴趣，而且对构成气体的百分比也感兴趣。
5. 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。
