过眼云烟

过

guò

to cross

眼

yǎn

eye (CL:隻|只[zhi1],雙|双[shuang1])

云

yún

abbr. for Yunnan Province 雲南省|云南省[Yun2 nan2 Sheng3]

烟

yān

tobacco (variant of 煙|烟[yan1])