bound

adjective [原级]必然的，肯定的；受约束的，有义务的；被……所限制的，被……所束缚的；要到……去的，驶往……的；装订好的，有封面的；（与……）紧密相连的，关系密切；准备就绪的；（语法要素）黏附的

• If one person, thing, or situation is bound to another, they are closely associated with each other. ^{与…密切相关的}

verb [vt. 及物动词]跳跃，蹦跳着走；形成……的边界，划界；限制，约束；突然增长，急剧上升；（尤指圆形的物体）弹回，弹开

• If a person or animal bounds in a particular direction, they move quickly with large steps or jumps. ^{跳跃着前行 •  He bounded up the steps and pushed the bell of the door.  他跳上了台阶，按了门铃。}

noun [抽象名词]界限，限制；蹦跳，跳跃

• Bounds are limits which normally restrict what can happen or what people can do. ^{界限; 限制; 范围}