不久之后 有多种搭配翻译.如：
第一：Soon afterward
Soon afterwards he joined the party.
不久之后,他就参加了派对.
第二：Shortly after
They arrived shortly after.
不久以后他们抵达了.
第三：Shortly afterwards 不久之后
Shortly afterwards,he wrote two more novels.
不久以后,他又写了两部小说.
当然不久以后根据句子的机构,有更灵活的翻译,如：not long before
It was not long before his name became a household word.
不久之后,他的名字就家喻户晓了.