A1 或 A number one 第一流的,头等的
例句：
'Nothing but it,' said Mr. Roker. 'One of 'em takes his twelve
pints of ale a day, and never leaves off smoking even at his meals.'
'He must be a first-rater,' said Sam.
'A1,' replied Mr. Roker.
“可不是么，”洛卡先生说，“他们中间有一位，一天喝十二品脱啤酒，哪怕在吃饭的时候，也是烟不离嘴。”
“他一定是个头等角色了，”山姆说。
“天字第一号，”洛卡先生答。
(Charles Dickens,The Pickwick Papers)
