since有几种意思]

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1. 从…以来
外贸英语四 silly 傻的；糊涂的;silver... ...
sin 罪,罪孽 vi.犯罪
since 从…以来；因为
sincere 真诚的；真挚的 ...
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2. 既然,因为
英语问题 ...
as因为 since既然,因为
now that既然 ...
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3. 因为(引导时间和原因状语从句)
[语法]语 法 结 构--连 接 词 ...
or else 否则；要不(就)(引导并列从句)
provided (=providing) 以……为条件,如果……的话,只要(引导条件状语从句,有时和that连用)
since 自从；因为(引导时间和原因状语从句) ...
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======以下答案可供参考======
供参考答案1:
since(sns)
adv. 1. From then until now or between then and now: They left town and haven't been here since.
2. Before now; ago: a name long since forgotten.
3. After some point in the past; at a subsequent time: My friend has since married and moved to California.
prep. 1. Continuously from: They have been friends since childhood.
2. Intermittently from: She's been skiing since childhood.
conj. 1. During the period subsequent to the time when: He hasn't been home since he graduated.
2. Continuously from the time when: They have been friends ever since they were in grade school.
3. Inasmuch as; because: Since you're not interested, I won't tell you about it.
since[sins]adv.以后, 后来, 以前prep.自从, 自...以来conj.自...以后, 自...以来, 因为, 既然since[sins]prep.自... 以来, ...以后since liberation解放以来since[sins]conj.从...以来; ...以后因为; 既然; 鉴于We have both changed since we parted.分别以来我们彼此都变了。It was three years since we had been there.我们在那儿已呆了三年。S-that is so, there is no more to be said.既然如此, 再没什么可说的了。since[sins]adv.[和完成时连用](=since then)以后, 后来, 以来以前(=ago)I have not seen him since.(那时)以后我没见到过他。It is two years since (we parted). (=We parted two years since [ago]). 我们是在两年以前分别的。 At first he refused but sincehas accepted.他最初拒绝, 但后来接受了。ever since从那时起, 一直到现在long since好久以前, 早已not long since就在不久since then其后, 从此一直