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persistent [pə'sistənt] a.坚持的，固执的
v. persist 坚持 (不顾阻拦，一味的坚持)
persist in doing sth.
He persists in making noise.
(近义词)stubborn adj. 顽固的, 固执的, 坚定的, 坚决的, 难应付的, 难处理的
You are stubborn. 你这个死脑筋 。
insist [in'sist] v.坚持做 ; 坚持认为，坚持说（是人的一种态度）
vt. &vi. 坚持，坚决认为; 坚决主张/要求，一定要
insist on doing sth. 坚持……
eg. My brother insists on going with me.
He insists on the importance of the meeting.
I insist on speaking to the manager.
My wife insists that I (should) have my hair cut.
