1. 孜孜不倦：08. Bowling = 保齡球 | 14. Peg away = 孜孜不倦 | 15. Doomed person = 注定失敗者

verb

1. work doggedly or persistently

e.g. She keeps plugging away at her dissertation

Synonym: plug awayslogkeep one's nose to the grindstonekeep one's shoulder to the wheel