punctilious
adjective formal uk/pʌŋkˈtɪl.i.əs/ us/pʌŋkˈtɪl.i.əs/
一丝不苟的；循规蹈矩的
very careful to behave correctly or to give attention to details
He was always punctilious in his manners. 他举止总是循规蹈矩。
Synonym: meticulous
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