钉是钉，铆是铆（釘是釘，鉚是鉚）　

◎ 钉是钉，铆是铆 dīng shì dīng mǎo shì mǎo

[be accurate in what one works;be conscientious and meticulous] 形容办事认真,一丝不苟。也作“丁是丁,卯是卯”