例句：

　　那天晚上我只睡了大約半個(gè)小時(shí)。

　　I only slept about half an hour that night.

　　我看我們需要大約20把椅子。

　　We'll need about 20 chairs, I should think.

　　機場(chǎng)在大約20公里遠的地方。

　　The airport was about 20 kilometres distant.

　　那可能會(huì )花費你大約五十美元。

　　That would probably cost you about fifty bucks.