第二年第二百八十九天

[nnozomi]

语法
S1 + V1 + (S2 +) 才 + V2 "it was not until X that Y..." (bottom of page)
https://resources.allsetlearning.com/chinese/grammar/Expressing_%22only_after%22_with_%22cai%22

词汇
十分, very/sufficiently (pinyin in tags)
https://mandarinbean.com/new-hsk-2-word-list/

Guardian:
只有当灯芯完全点燃的时候才是它的完全形态, it is not until the wick is completely alit that it reaches its complete form
经过多少练习♫♫才会成为这样的你🎶, through how much practice will I be able to become like you
特调处研究员的工作十分重要, the work of a researcher at the SID is sufficiently important

Me:
看那封信我才发现他的感受。
你做得十分好，别担心了。