釘是釘，鉚是鉚

lit. a nail is a nail and a rivet is a rivet (idiom) / fig. meticulous / conscientious / unambiguous

nail / to follow closely / to keep at sb (to do sth) / variant of 盯[ding1]

to join things together by fixing them in place at one or more points / to nail / to pin / to staple / to sew on

variant of 是[shi4] / (used in given names)

to be (followed by substantives only) / correct; right; true / (respectful acknowledgement of a command) very well / (adverb for emphatic assertion)

to fasten with rivets / (coll.) to exert one's strength