I can look back on things with a clear conscience. I did everything I could.我可以问心无愧地回首过去,我已经尽力了。Looking back, she feels she should never have hung up her backpack.回首过去,她觉得自己真不该放下背包不再徒步旅行。They can look back on their endeavours with pride.他们可以骄傲地回首过去付出的努力。I always look forward, not back.我总是放眼未来,而不是回首过去。