A casebook is a detailed written record — a book or a file that works like one — kept by a doctor, a social worker, or a police officer of the cases they have dealt with: who the person is, what happened, what was done, what comes next. Each person or problem is a “case,” so the book is where those cases live.

A casebook is a detailed written recordcasebook是一份詳細的書面紀錄——a book or a file that works like one一本本子，或是功能像本子的檔案——kept by a doctor, a social worker, or a police officer由醫生、社工，或警察保存，of the cases they have dealt with記錄他們處理過的案子，who the person is, what happened, what was done, what comes next這個人是誰、發生了什麼事、做了什麼處理、接下來要怎麼樣。Each person or problem is a "case,"每個人或每個問題就是一個「case」，so the book is where those cases live所以這本書就是這些case住的地方。

It is a workplace word, a little formal; you are not meant to leave it on the bus.

It is a workplace word, a little formal這是工作場合的用字，有點正式，you are not meant to leave it on the bus你不應該把它忘在公車上。

Though actually, law students also use casebook for a textbook stuffed with real court cases to study. Same spelling, different shelf: one is a record of your own work with people; the other is a school book of other people’s trials. The sense here is the first, the file of cases you have handled.

Though actually不過其實，law students also use casebook法律系學生也用casebook，for a textbook stuffed with real court cases to study指一種塞滿真實法庭案例、拿來讀的教科書。Same spelling, different shelf拼法一樣，架上放的位置不同，one is a record of your own work with people一種是你自己處理人的工作紀錄，the other is a school book of other people's trials另一種是別人官司的教科書。The sense here is the first這裡講的意思是第一種，the file of cases you have handled也就是你經手過的案子檔案。