pris·tine /ˈprɪsˌtin, prɪˈstin, ||ˈprɪsˌtaɪn/
(a.)原來的,古時的,原始的
Pris·tine a. Belonging to the earliest period or state; original; primitive; primeval; as, the pristine state of innocence; the pristine manners of a people; pristine vigor.
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pristine
adj 1: completely free from dirt or contamination; "pristine
mountain snow"
2: immaculately clean and unused; "handed her his pristine
white handkerchief"