N2 — outside your level filter
write + while
kaki tsutsu
while; even as — formal/literary; marks either simultaneous action or, more often, a concession the subject is aware of
meaning: while writing
体に悪いと分かりつつ、タバコをやめられない。
karada ni warui to wakari tsutsu, tabako o yamerarenai.
I can't quit smoking, while understanding it's bad for my health. neutral
彼女は微笑みつつ、静かにうなずいた。
kanojo wa hohoemitsutsu, shizuka ni unazuita.
She gave a quiet nod, smiling all the while. neutral