请问“义务”responsibility,duty ,bound的区别

查了点例句,你自己感受一下区别吧
responsibility
n.责任,职责
例句
administrative responsibility
行政责任
criminal responsibility
刑事责任
faultless responsibility
无过失责任制
moral responsibility
道德责任
attribute responsibility to.
把责任、过错归于某人.
duty n.义务,责任,职责,职务,税
例句
active duty
现役
Duty bound
做认为应该做的；理应如此
export duty
出口税
import duty
进口税
moral duty
道德义务
bound n.跃进,跳,范围,限度
adj.正要启程的,开往...去的,被束缚的,装订的
v.跳跃,限制
例句
bound water
结合水
Duty bound
做认为应该做的；理应如此
Prometheus Bound
《被缚的普罗米修斯》
Bound with iron.
用铁捆缚的
branch and bound method
分枝限界法