例句：
Wine contains about 10% alcohol.
葡萄酒含有约10%的酒精。
He's very intense about everything.
他对一切都很热心。
It's about 2 metres wide.
它大约2米宽。
He looked about the room.
他在房间里四下看了看。
I'm definite about this.
我对这事毫无疑问。
You're completely mistaken about Jane.
你对简的看法完全错了。