self·same
adjective/ˈselfseɪm/
/ˈselfseɪm/
[only before noun] the, this, etc. selfsame…
- used to emphasize that two people or things are the same
（强调两者完全相同）同一的 - Jane had been wondering that selfsame thing.
简也一直在为同一件事纳闷。
- Jane had been wondering that selfsame thing.