punctilious
adj
(fml 文) very careful to carry out one´s duties, etc correctly; very attentive to details of behaviour or ceremony (在履行职责等上)一丝不苟的; (在行为或礼节上)谨慎的
a punctilious attention to detail 对细节一丝不苟
a punctilious observance of the formalities 礼节上的拘谨.