1. 挣扎下去：struggle back 挣扎着逃跑 | struggle on 挣扎下去 | struggle 竞争

2. 斗争下去：walk on 走着直着 | struggle on 斗争下去 | work on 继续工作

3. 挣扎求存 /生存：bravely 勇敢地 | struggle on 挣扎求存 /生存 | supply sb sth 给某人提供某物

1. 勉力维持;在困难中坚持
    If you struggle on, you continue doing something rather than stopping, even though it is difficult.

    e.g. Why should I struggle on to please my parents?...
           为什么我要强装笑颜取悦我的父母？
    e.g. The rest of the world struggles on with its perpetual problems, poverty and debt.
           世界上其他国家仍在苦苦同永恒的贫困和债务问题作斗争。