义务的英文是 "duty"。在不同的上下文中，也可以用 "obligation" 或 "responsibility" 来表达相似的意思。
1. duty是什么意思
音标: 英 ['dju:tɪ] 美 [ˈdutɪ, ˈdju-]
n. 责任, 关税, 职务, 尊敬
[化] 职责
n. the social force that binds you to the courses of action demanded by that force; every opportunity, an obligation; every possession, a duty"- John D.Rockefeller Jr
n. work that you are obliged to perform for moral or legal reasons
n. a government tax on imports or exports
2. obligation是什么意思
音标: 英 [ˌɒblɪ'ɡeɪʃn] 美 [ˌɑblɪˈɡeʃən]
n. 义务, 责任, 约束, 契约, 恩惠, 债务
[经] 待付款, 债务, 义务
n. the state of being obligated to do or pay something
n. a personal relation in which one is indebted for a service or favor
n. a legal agreement specifying a payment or action and the penalty for failure to comply
3. responsibility是什么意思
音标: 英 [rɪˌspɒnsə'bɪlətɪ] 美 [rɪˌspɑnsəˈbɪlɪtɪ]
n. 责任, 职责, 负担, 可靠性
[化] 职责
n. a form of trustworthiness; the trait of being answerable to someone for something or being responsible for one's conduct