hard coated seed

例句：

1. 1. The seeds are hard-coated and need to be soaked in water for several days before planting.
   这些种子是硬涂层的，需要在种植前浸泡几天。
2. 2. The hard-coated seed is resistant to pests and diseases, making it a popular choice for farmers.
   这种硬涂层种子对害虫和疾病有抵抗力，因此是农民们的首选。
3. 3.The hard-coated seed has a high nutritional value, providing the soil with essential nutrients.
   这种硬涂层种子营养价值高，为土壤提供了必需的养分。