stem nodule的用法和样例：
例句
- Since the urease activity in soil is close correlated with the growth of stem lump mustard and soil metabolism, which is a key indicator of soil ecology and soil fertility.
土壤脲酶活性高低反映出茎瘤芥生长和土壤代谢状况，可作为茎瘤芥土壤生态和肥力水平的一个良好指标。 - Methods of environmental investigation were adopted to study the contents of heavy metals in the soil at the tumorous stem mustard cultivation base in Nantuo, Fuling.
采用环境调查的方法研究了涪陵南沱镇茎瘤芥种植基地土壤重金属含量。
