例句：
那天晚上我只睡了大约半个小时。
I only slept about half an hour that night.
我看我们需要大约20把椅子。
We'll need about 20 chairs, I should think.
机场在大约20公里远的地方。
The airport was about 20 kilometres distant.
那可能会花费你大约五十美元。
That would probably cost you about fifty bucks.
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