[畜牧]?改良牧场

... improved grassland 改良草地 improved pasture 改良牧场 improved pen 改良畜圈 ...

[畜牧]?改良牧地

... 改良牧场 improved pasture 改良牧地 improved pasture 改良畜圈 improved pen ...

?改良草地

... impressed variation 强力压制变异 improved pasture 改良草地 improved variety 育成种 ...