消沉: depressed, bad mood, low spirit...
演习: maneuver, exercise, practice, to maneuver...
视频: video...
珍贵: precious...
上限: upper bound...
乘客: passenger...
停止: to stop, to halt, to cease...
本子: book, notebook, Japanese-style self-published comic (esp. an erotic one), aka dōjinshi, edition...
听讲: to attend a lecture, to listen to a talk...
留学: to study abroad...