all on a sudden meaning in English

突然, 冷不防

I was now master , all on a sudden , of above 5000 l
我对他说，我之所以有今天，除了主宰一切的天意外，全靠了他的帮助。
While i sat thus , i found the air over - cast , and grow cloudy , as if it would rain ; soon after that the wind rose by little and little , so that , in less than half an hour , it blew a most dreadful hurricane : the sea was all on a sudden cover d over with foam and froth , the shore was cover d with the breach of the water , the trees were torn up by the roots , and a terrible storm it was ; and this held about three hours , and then began to abate , and in two hours more it was stark calm , and began to rain very hard
我以前从未碰到过地震，也没有听到经历过地震的人谈起过，所以我一时吓得目瞪口呆，魂飞魄散。当时，地动山摇，胃里直想吐，就像晕船一样而那山石崩裂发出震耳欲聋的巨响，把我从呆若木鸡的状态中惊醒过来，我感到胆战心惊。小山若倒下来，压在帐篷上和全部家用物品上，一下子就会把一切都埋起来。