pertinacious
adj
(fml 文) holding firmly to an opinion or a course of action; determined 坚持的; 固执的; 坚决的
His style of argument in meetings is not so much aggressive as pertinacious. 他在会议上的辩论态度并非锋芒逼人而是坚持己见.
Nothing can be compared, he maintains, with the first cockcrow, the twittering of birds at dawn, the sight of the rising sun glinting on the trees and pastures.