得看你是那方面的只是了?
是数据库方面的呢还是?
when y有多种解释：
1.(用作疑问副词)什么时候,何时
I'd like to know when they'll let him out.
我想知道他们什么时候放他.
When did you last see Margaret?
你上一次见到玛格丽特是什么时候?
2.(用作关系副词,引导关系从句)当...时
There were times when I didn't know what to do.
有些时候我不知道该怎么办才好.
conj.
1.当...时
John got engaged to her when travelling last winter.
去年冬天旅行时,约翰与她订了婚.
Don't get excited when you talk.
你说话时别激动.
2.既然,考虑到
How can he get the promotion when his boss dislikes him?
既然上司不喜欢他,那他怎么会获得提升呢?
3.虽然,然而
I had only fifteen dollars on me when the book I wanted cost twenty.
我身上只带了十五元钱,可是我想买的那本书定价二十元.
4.在那时,然后
pron.
1.什么时候,那时
Since when has she taught here?
她从什么时候开始在这儿教书的?
n.
1.(事件发生的)时间[the S]
as
ad.
1.跟...一样地,同样地
Sam is as rich as Alexander.
山姆像亚历山大一样富有.
2.如同;例如
Such animals as foxes and squirrels have bushy tails.
有些动物,如狐和松鼠,有蓬松的尾巴.
prep.
1.作为,以...的身份
She works as an interpreter in that company.
她在该公司里担任翻译员.
2.当作
She didn't think much of him as a painter.
她对他作为一位画家评价不高.
3.像;如同
The old woman was dressed as a young lady.
这位老妇人打扮得像一位年轻人.
conj.
1.像...一样;依照;像
You ought to do as Paul tells you.
你应按照保罗吩咐的做.
The work is not so difficult as you imagine.
这工作不像你想像的那么困难.
2.当...时
As she left the room she remembered that book.
她离开房间时想起了那本书.
3.随着
As the sun rose the fog dispersed.
太阳一出来,雾随之消失.
4.因为
We didn't know what to do as we were just visiting there.
我们不知道该怎么办,因为当时我们仅仅在那里作访问.
5.虽然
Tired as he was,he sat up late.
他虽然疲倦,可仍然很晚才睡.
pron.
1.(与such,the same,as等连用,引导关系从句)与...相同的事物(或人)
He has earned as much money as I have.
他赚的钱和我赚的一样多.
She felt just the same as he did.
她和他的感受相同.
There is a general rise in prices such as occurred in the late 60's.
物价普遍上涨,跟六十年代末一样.
2.(引导从句,对前述内容作补充)本情况,该事实
She has married again,as was expected.
她已再婚,这是意料中的事.
We are tired,as anyone can see.
我们累了,这是有目共睹的.
不知道是否满意