同义词解析?

duty
n.
1.责任; 义务; 本分
One of my duties is to file the letters.
我的职责之一是将信件归档.
It is our duty to defend our country.
保卫国家是我们的义务.
Customs duties are paid on imported goods.
对进口货物征收关税.
2.职责; 职能; 职分
3.尊敬; 敬意; 恭敬; 孝顺,忠节
4.税; 关税
5.【军】任务; 勤务; 兵役
6.【机】(机器在给定条件下所做的)功; 能(效)率; 负载; 工作状态; 生产量
7.【农】(单位土地上某种作物需要的)灌溉量; 灌溉率
8.【宗】礼拜,(修行的)功课
9.[口](小孩)拉屎
His sense of duty is very strong.
他的责任心很强.
one's duty to his parents
对父母应尽的义务
At the age of nineteen he began his duty.
他19岁时开始服兵役.
the rights and -ties of a citizen
公民的权利和义务
doctor's -ties
医生的职责
The children send their duty to their teachers.
孩子们对他们的老师很尊敬.
An old wooden box did duty for a table.
一个旧木箱作桌子用.
obligation
n.
1.义务; 职责,负担
You are under no obligation to buy the house if you have not signed a purchase agreement.
如果你没有签订购买合同,就不一定非买这房子不可.
We were under obligation to finish the work in a satisfactory way.
我们有义务圆满地完成工作.
The builder failed to fulfil the terms of his obligation.
营造商未能履行合同的条款.
repay an obligation
报答恩惠
Our parents fulfilled their obligation to support us.
父母亲尽到了抚养我们的责任.
2.契约; 证书; 债务
3.恩惠; 人情债
liability
n.
1.责任,义务
Lack of education was a liability in getting a job.
缺少教育对找工作不利.
my liability to bad colds
我容易得重感冒
He admitted his liability for the accident.
他承认自己对这起事故应负责任.
2.易患; 易染
3.[pl.]债务,负债
4.不利条件,缺点
5.倾向
Bad pronunciation is a liability in being a narrator.
不良的发音是做解说员的不利条件.
a company with more -ties than assets
一个负债多于资产的公司
hold no liability for damages
不负赔偿责任
liability to flu[disease]
易患流感[疾病]
liability for military service
有服兵役的义务
obligation
n.
1.义务; 职责,负担
You are under no obligation to buy the house if you have not signed a purchase agreement.
如果你没有签订购买合同,就不一定非买这房子不可.
We were under obligation to finish the work in a satisfactory way.
我们有义务圆满地完成工作.
The builder failed to fulfil the terms of his obligation.
营造商未能履行合同的条款.
repay an obligation
报答恩惠
Our parents fulfilled their obligation to support us.
父母亲尽到了抚养我们的责任.
2.契约; 证书; 债务
3.恩惠; 人情债