shǔ quǎn fèi rì
lit. Sichuan dogs bark at the sun (idiom); fig. a simpleton will marvel at even the most common things
alludes to the Sichuan foggy weather where it's uncommon to see a sunny day
蜀
shǔ
short name for Sichuan 四川[Si4 chuan1] province
犬
quǎn
(literary) dog
吠
fèi
to bark
日
rì
abbr. for 日本[Ri4 ben3], Japan