彼(かれ)はこの分野では草分けだ。
He is a trailblazer in this field.
grass, weeds, herbs, pasture, write, draft
ソウ / くさ
part, minute of time, segment, share, degree, one's lot, duty, understand, know, rate, 1%, chances, shaku/100
ブン / わ.ける