secondary nutrients
英 [ˈsekəndri ˈnjuːtrɪənts]
美 [ˈsekənderi ˈnutriənts]
网络 次级营养素
双语例句
- City domestic sludge mainly comes from sewage treatment, in which contains some toxic substances such as heavy metals, and easily causes secondary pollution problems for improper disposal. On the other hand, in domestic sludge exist abundant nutrients for plant growth.
城市生活污泥是污水处理厂污水处理的产物，其中含有许多对植物生长有益的营养物质，同时含有一些有毒有害物质如重金属等，如果处理或使用不当，会再次对环境造成污染。