兢兢业业: be conscientious and do one's best; assiduous; be attentive (to one's business); be careful and conscientious; be conscientious and earnest; cautious and attentive; constantly on one's gua
勤勤恳恳: work diligently and conscientiously; be (always) diligent and conscientious; earnest and assiduous; painstakingly; zealously and earnestly 短语和例子勤勤恳恳地为人民服务 be diligent and conscientious in