n. 坚持要求某种品质的人, 坚持要求一丝不苟者, 难题, 费解的事物

[ noun ]
someone who insists on something
<noun.person>
a stickler for promptness

Stickler \Stic"kler\ (st[i^]k"kl[~e]r), n. [See {Stickle}, v.
t.]
One who stickles. Specifically:
(a) One who arbitrates a duel; a sidesman to a fencer; a
second; an umpire. [Obs.]

Basilius, the judge, appointed sticklers and
trumpets whom the others should obey. --Sir P.
Sidney.

Our former chiefs, like sticklers of the war,
First sought to inflame the parties, then to poise.
--Dryden.
(b) One who pertinaciously contends for some trifling things,
as a point of etiquette; an unreasonable, obstinate
contender; as, a stickler for ceremony.

The Tory or High-church were the greatest sticklers
against the exorbitant proceedings of King James
II. --Swift.