although at times learning a language was frustrating,although at times 在句中是什么成分

although at times learning a language was frustrating,although at times 在句中是什么成分 how many times have you taken a plane?although they are brothers,they donnot like each other at at all times at all times at different times of 用at times造句 at times造句 at all times 快 at all times at times of at times 与 some times 区别是什么? at times如何被提问 用at other times造个句! at times类似于哪个短语 英语翻译Although at times,learning a language was frustrating,_________(但却非常值得努力)It is not easy to do scientific research_______________(不仅需要时间、精力、和经费,还需具有自制力和奉献精神) 英语翻译Although interventions made at various times in the management of water for agriculture are done to achieve sustainable increases in production,in reality sustainability is achieved by continuous changes in management and infrastructure d Le Le Le