then创立造句 since

since then的意思是从那时起，例如Exactly four years have passed since then.从那时起，整整4年过去了。

It was the first in the e then，about one hundred nations have followed that example.这是世界上第一次。从那时起，大约有100个国家效仿了这个例子。

Ever since then I've been longing to meet him .从那以后我一直渴望见到他。

She's teach English since then.

从那时起她就教英语。