eternal
adjective uk/ɪˈtɜː.nəl/ us/ɪˈtɝː.nəl/
永远的，永恒的;长期的
lasting forever or for a very long time
The company is engaged in the eternal search for a product that will lead the market. 该公司一直在寻找可以引领市场的产品。
Will you two never stop your eternal arguing! 你们俩永远也争吵不完！
Idiom
hope springs eternalidiom saying 希望之泉永不枯竭;希望常在
said when you continue to hope that something will happen, although it seems unlikely