第三年第两百三十七天

[nnozomi]

成语
费尽心思 to rack one's brains, to use all the knowledge at hand
同归于尽 to die along with the enemy, mutually assured destruction
仁至义尽, great benevolence, virtue and duty
费尽心思 fèijìn xīnsi; 同归于尽 tóngguī yújìn; 仁至义尽 rén zhì yì jìn

词汇
姑娘, girl/Miss 姑娘 gūniang, girl/Miss
https://mandarinbean.com/new-hsk-3-word-list/

Guardian:
他费尽心思来伪装自己, he made every effort to disguise himself
最好他们两个同归于尽, ideally the two of them will do each other in
我已经等了这么久了，仁至义尽啊, I've been waiting so long already, thanks a million
姑娘，你的药单掉了, Miss, you dropped your prescription

Me:
他们费尽心思终于明白了。
这么小姑娘真的是研究生吗？