丁是丁，卯是卯

Explanation: Safety must be a nail in the corresponding riveting Department, can not have errors. Described on the matter seriously and unambiguous. 　　Usage: Complex sentence; for clause; with compliment 　　Source: Qing Cao Xueqin's "Dream of Red Mansions" 43 back: "I see you the pros and cons with you tomorrow, and I have 'D is D, d is the d', and you also do not complain." 　　Examples: He spoke things ~, we won the trust. Thesaurus:  Ding Kakuji, Ding Mao II, dingshiding, maoshimao