在完全没有语境的情况下,这条句子是无法独自成立的,因为句中缺少谓语(只可能是在连续对话中被省略了)。换句话说,这句话必须是承袭之前的语义才能解释。例如:——Does this happen often?——Not really, the first time it happened was two years ago, and another time five months ago. 或者:——When did it happen?——The firt time (it happened)was about two years ago.——And after that?——Another time five m...