患难与共 share hardships and dangers;go through trials and tribulations together;share weal and woe(with);come(或go)together through thick and thin持之以恒 pursue a matter with determination ;make consistent efforts;do sth perseveringly;persist
什么动物是患难与共的
天鹅 鸳鸯 死了一只另外一只会不吃不喝殉情