These chemical compounds are not necessary for the primary survival of the tea plant's cells; they are what is known as secondary compounds.

这些化合物并不是茶树细胞生存所必需的物质，它们被称为次生化合物。

youdao

The huge biomass of sugarcane is mainly composed of monosaccharides and polysaccharide, which are the original or secondary compounds to store energy from photosynthesis.

甘蔗是生物量最高的作物之一，主要化学成分是单糖和多糖；

youdao

Plant secondary compounds could decrease the food intake, digestibility and protein availability, and some compounds could effect the normal reproductive performance of herbivorous mammals.

植物次生化合物可降低动物的食物摄入量及消化率、蛋白质可利用率。 某些次生化合物还影响植食性哺乳动物的正常繁殖活动。

youdao

The compounds in their breath were analysed using a technique called secondary electrospray ionisation mass spectrometry (SESI-MS), which is capable of detecting extremely small elements of the chemicals present in their breath.

BBC: Lung infection identified using 'breath-print'