在比较中用来指事物的程度： used in comparisons to refer to the degree of something:
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She'll soon be as tall as her mother.
I can't run as fast as you.
skin as soft as a baby's
It's not as good as it used to be.
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用于描述某人或某物的目的或质量：
used to describe the purpose or quality of someone or something:
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She works as a waitress.
It could be used as evidence against him.
The news came as quite a shock to us.
I meant it as a joke.
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因为：
because:
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As it was getting late, I decided to book into a hotel.
You can go first as you're the oldest.
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在特定时间：
during the time that:
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I saw him as I was coming into the building.
He gets more attractive as he gets older.
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相同方式：
in the same way:
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He got divorced, (just) as his parents had done years before.
This year, as in previous years, tickets sold very quickly.
As with his earlier movies, the special effects in his latest film are brilliant.
As is often the case with children, Amy was completely better by the time the doctor arrived.
As I was just saying, I think the proposal needs further consideration.
Knowing him as I do, I can't believe he would do such a thing.
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虽然：
although:
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Angry as he was, he couldn't help smiling.
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用于比较两个事物，人物，群体或素质：
used in expressions that compare two things, persons, groups, or qualities:
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This jacket costs twice as much as that one.
They live in the same town as my parents.
She'll soon be as tall as her mother.
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似乎是或正在：
appearing to be, or being:
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He went to the costume party dressed as a banana.
As a child, Miriam had lived in India.
The news came as no surprise.
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