good strains of seed

例句：

1. 1.The farmers are looking for good strains of seed to improve their crops.
   农民们在寻找好的种子品种来提高他们的农作物。
2. 2.The new variety of seed is said to have good strains of resistance to pests.
   据说这种新品种的种子具有对害虫良好的抗性。
3. 3. Good strains of seed can help farmers increase yields and reduce the use of chemical fertilizers.
   好的种子品种可以帮助农民增加产量，减少使用化学肥料。