重点词汇
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草地
lawn; grass; grassland; meadow; turf; pasture; prairie; sward; greensward
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改良
improve; ameliorate; reform; upgrade; enhance; refine; perfect; meliorate; improvement; amelioration; betterment; refinement
grassland improvement
草地
lawn; grass; grassland; meadow; turf; pasture; prairie; sward; greensward
改良
improve; ameliorate; reform; upgrade; enhance; refine; perfect; meliorate; improvement; amelioration; betterment; refinement