pertinacy
(colloquial) Any time close to three o'clock.
Obsolete form of pertinacity.
(informal, intransitive) To do random unplanned work or spend time idly / (informal, intransitive) To attempt to do something with a piece of equipment without understanding how it works.
A device for converting wind power into electricity.
教授は度重なる挫折にもかかわらず研究を続けるその学生の粘り強さを称賛した。
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DiQt
Free
★★★★★★★★★★