改良品种

例句：

1. 1.The farmer has developed a new variety of wheat to improve its yield.
   这位农民已经培育出一种新的小麦品种，以提高产量。
2. 2.This is the first time we have seen such a high-yielding variety of rice.
   这是我们第一次看到如此高产的水稻品种。
3. 3.The breeder hopes to introduce this improved variety to the market soon.
   育种者希望不久将这种改良品种引入市场。