英语语法Buffalo herds,which once thrived in the Great Plains of
英语语法
Buffalo herds,which once thrived in the Great Plains of North America,trampled vegetation,1.(thereby aiding future plant growth by returning nutrients)
2.(thereby an aid to future plant growth returned nutrients)
1句是正确的,和2句的区别是啥,为啥1句thereby 后面可以直接用aiding,ing形式?)