Let me give you some clues. It's a word of just three letters.
You can't see it. You can't taste it. You can't hear or feel
it. Nor can you smell it. And yet without it, we would not last
very long. Got it? Yes, it's the stuff we all breathe in and
out and it's called ?air?. Small it may be but it crops up in
all sorts of places.
最後一句句法看起來好怪，請版上高手解答一下~
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