ちらと の訳語→ momentarily quick restrained
つかのま の訳語→ brief briefly ephemeral moment sufficiently
とっさの の訳語→ initial sudden unthinking
ふと の訳語→ abruptly accidental chance dare inadvertently instantly involuntarily just soon suddenly unbidden unexpectedly when
一瞬 の訳語→ bit blinking flash fleeting glance heartbeat instant minute next once sec second slightly split-second temporarily time