B2 from a particular time in the past until a later time, or until now此后,从此
More examples
Hostilities between the two groups have been in abeyance since last June.
Roz has adopted one or two funny mannerisms since she's been away.
I've been chewing the problem over since last week.
Their movements have been severely circumscribed since the laws came into effect.
Your piano playing has really come on since I last heard you play.
A2 from a particular time in the past until a later time, or until now自从…;从…以来
B1 because; as因为;既然
More examples
I'm afraid I'm not a very good advertisement for the diet since I've actually put on weight!
She stands a good chance, since only two people are contesting the seat and the other candidate is very unpopular.
I can testify to the foregoing since I was actually present when it happened.
There's no point hypothesizing about how the accident happened, since we'll never really know.
I presume that they're not coming, since they haven't replied to the invitation.
B1 from a particular time in the past until a later time, or until now自从…;从…以来
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