1.They persistently lobbied the National Commission of Indigenous People with great tenacity.
他们一直努力不懈游说国家原住民委员会。
2.You have prevailed in your task, with great tenacity, self-motivation and rugged determination, often in very difficult circumstances.
你们在困难的情况下以顽强的毅力，努力和自信完成了学业。