A：What a coincidence seeing you here.!
这么巧在这儿遇见你!
B：It is, isn't it?
是啊，可不是吗?
注释：
a.coincidence n. 巧合
What a coincidence! 多巧!
例：A: I was born on June 6th.
(甲：我是6月6日出生的。)
B: What a coincidence! I was born on the same day.
(乙：真巧!我的生日也是那一天。)
b. What a coincidence seeing you here!
= What a coincidence!I didn't expect to see you here.
(真巧!我没料到会在这里见到你。)