不大: not very, not too, not often...
烦躁: jittery, twitchy, fidgety...
性能: function, performance...
忍不住: cannot help, unable to bear...
约束: to restrict, to limit to, to constrain, restriction, constraint...
月票: monthly ticket...
呜咽: to sob, to whimper...
香肠: sausage...
敏捷: nimble, quick, shrewd...
战友: comrade-in-arms, battle companion...