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Meaning of 钉是钉,铆是铆

Lookup via: Pinyin | Radicals
dīng shì dīng , mǎo shì mǎo (Trad.: 釘是釘,鉚是鉚)
lit. a nail is a nail and a rivet is a rivet (idiom); fig. meticulous; conscientious; unambiguous