since [sɪns]

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adv.后来；conj.既然，因为，自从；prep.自从

from a particular time in the past until a later time , or until now

He's been working in a bank since leaving school. 自从毕业后，他就一直在一家银行工作。
I have known him ever since I was a child. 我自孩提时代起就已经认识他了。