tā / duō / nián / mái / tóu / yán / jiū / jī / hū / dào / le / yǎng / wū / zhù / shū / de / dì / bù

他多年埋头研究，几乎到了仰屋著书的地步。

He devoted himself to research for years, almost to the point of giving his whole being to writing.