入伍两年退伍费多少:请为我介绍since这个单词……

since

AHD:[s¹ns]
D.J.[sins]
K.K.[s!ns]
adv.（副词）
From then until now or between then and now:
自从…以后：从那时代到现在或那时和现在之间：
They left town and haven't been here since.
他们离开了镇子，从那以后再也没有来过这儿
Before now; ago:
以前；从前：
a name long since forgotten.
一个以前长久为人所遗忘的名字
After some point in the past; at a subsequent time:
从那以后：从过去某一点以后；在后来的一段时间：
My friend has since married and moved to California.
我的朋友从那以后就结了婚并移居到加利福尼亚
prep.（介词）
Continuously from:
连续地自…以来：
They have been friends since childhood.
他们从幼时起一直是好朋友
Intermittently from:
从…以来：
She's been skiing since childhood.
她从幼时起就开始滑雪
conj.（连接词）
During the period subsequent to the time when:
在…以后的一段时间里：
He hasn't been home since he graduated.
他毕业后没回过家
Continuously from the time when:
从…时起一直：
They have been friends ever since they were in grade school.
他们从小学起就一直是好朋友
Inasmuch as; because:
既然；因为：
Since you're not interested, I won't tell you about it.
既然你不感兴趣，那我就不告诉你了

Middle English sinnes
中古英语 sinnes
contraction of sithenes
sithenes的缩写
sithen [since] from Old English siththan sºh [after] than variant of th³m [dative of] thæt [that] * see that
sithen [从…以后] 源自 古英语 siththan sºh [在…以后] than th³体 [] thæt的与格 [那个] *参见 that
-es [adv. suff.] * see -s 3
-es [副词后辍] *参见 -s3

since
[sIns]
prep.
自…以来； 自…以后
I have been there many times since the war.
自那次战争以来，我曾去该地多次。
"Since then, he has developed another bad habit."
"自那以后,它养成了另一种环习惯。"
"Since then, they have been trying to find out how the fire began."
"自那时以来,他们一直在设法查明起火的原因。"

词性变化

since
conj.连词
自…以后； 自…以来
What have you been doing since I last saw you?
自我上次和你见面以后，你在做什么？
既然；因 为
Since you ask, I will tell you.
你既然问，我就告诉你。
"Since many of the customers work during the day, Billy has to collect the money at night."
"因为许多顾客白天上班,所以毕利只好晚上去收钱。"

since
adv.副词
其后，后来
At first he refused but since has accepted.
他最初拒绝，但后来接受了。
We have been friends ever since.
自此以后我们一直是朋友。
"The fish, which has since been sent to a museum where it is being examined by a scientist, is called an oarfish."
"这条后来被送到一个博物馆,在那里接受一位科学家的观察、研究的鱼,名叫皇带鱼。"
以前
How long since is it?
那是在多久以前？