trace element solution

例句：

1. 1. The researcher analyzed the composition of the soil to determine its trace element content.
   研究员分析了土壤的成分，以确定其痕量元素含量。
2. 2. The plant's growth requires trace elements that are not easily available in nature.
   植物生长需要不易在自然界中找到的痕量元素。
3. 3.The doctor prescribed a trace element solution for her patient's dietary supplementation.
   医生为她的患者的膳食补充剂开了一种痕量元素溶液。