钉是钉，铆是铆

dīng shì dīng , mǎo shì mǎo

lit. a nail is a nail and a rivet is a rivet (idiom)

fig. meticulous; conscientious; unambiguous

钉

dīng

nail

是

shì

to be (followed by substantives only)

钉

dīng

nail

，

,

铆

mǎo

to fasten with a rivet; to rivet

是

shì

to be (followed by substantives only)

铆

mǎo

to fasten with a rivet; to rivet