同学: to study at the same school, fellow student, classmate...
机器人: robot, android...
向来: always (previously)...
获悉: to learn of sth, to find out, to get news...
倒车: to reverse (a vehicle), to drive backwards...
入场券: admission ticket...
发炎: to become inflamed, inflammation...
捐赠: to contribute (as a gift), to donate, benefaction...
臂: arm...
石头: stone...
