释义
ad. 后来 conj. 既然,因为 prep. 自从
例句
1. Since you can't answer the question, perhaps we'd better ask someone else. 既然你无法回答这个问题，我们最好再问问别人。 2. We've been friends ever since we met at school. 自从我们在学校认识之后，我们就一直是好朋友。