He said that he was going to visit China before long and he had the idea long before.这里long before 与before long

He said that he was going to visit China before long and he had the idea long before.这里long before 与before long
He said that he was going to visit China before long and he had the idea long before.
这里long before 与before long

He said that he was going to visit China before long and he had the idea long before.这里long before 与before long
long before 很久以前
before long 不久之后

他说他不久便将去访问中国，他很久前就有这个想法了

他说不久会他就要去访问中国，且很久之前他就有这个想法

long before 很久以前 before long 不久