After the Chunin Exams, Katasuke has returned to work at the invitation of the Hokage. Upon seeing him, Boruto becomes annoyed thinking about what happened during the exam. Team 7 is given a mission to escort Katasuke and transport a Scientific Ninja Tool. Stuck on a mission he doesn’t like, Boruto runs into Ao while aboard the Thunder Train headed to their destination.
For things like prosthetic arms and legs.
.لصناعة أشياء كالأذرع والسّيقان الاصطناعيّة
Und zwar solche wie
Arm- und Beinprothesen.
Se hacen muchas
extremidades artificiales.
Se hacen muchas
extremidades artificiales.
Proprio così, parlo ad esempio 
di protesi per braccia e gambe.
Coisas como próteses de braços e pernas.
Так появились протезы рук и ног.