有...义务

Do we have any obligation to look after old people ?

应负责的，有义务的

Members of Egypt's 2,000-strong Bahai community, for instance, have found they cannot state their religion on the national identity cards that all Egyptians are obliged to produce to secure such things as driver's licences, bank accounts, social insurance and state schooling.

例如达到2000之多的巴哈教社区的成员们已经发现他们不能在身份证上表明他们的宗教信仰，而所有埃及人都有义务这样做来获得诸如驾照、银行帐户、社会保险以及享受国有教育等。

Be in duty bound to do sth.

有义务做某事

Be bound to do the work.

有义务做这工作。

You should be committed to taking care of your grandmother.

你应当有义务照顾你的祖母。

The state will be obliged to provide health care and education as of right.

国家有义务提供属正当权利的医疗保健和教育。

Be supposed / sE5pEuzd / to do sth.

有义务做……；应该做

If only she hadn't mentioned research. Now I feel beholden.

如果她没有提到研究，我现在也不会觉得有义务要这么做。

British bioethicist Albert Weale argues in Cosmos Magazine that despite potential concerns over modified foods, there is "an ethical obligation to explore whether GM crops could reduce poverty, and improve food security and profitable agriculture in developing countries."

英国生物学家阿尔伯特·威尔在宇宙杂志中主张，尽管对转基因食品潜在的危险担忧，但"有义务探讨转基因食品是否能够减少贫困，改善粮食危机，有益于发展中国家的农业"。

Any persons who have heard the blasphemer are obliged to rebuke him sharply in words, if it should happen that this can be done without danger to themselves, and they are obliged to report the same or bring it to the knowledge of an ecclesiastical or secular judge within three days.

任何人谁听取了渎神不得不大幅训斥他的话，如果它应该发生的，也是可以做自己没有危险，他们有义务报告相同或使其知识的宗教或世俗的法官在3天之内。

If you are unfortunate enough to the lovelorn, please tell me, I will help you out, really, please contact me!

如果你不幸失恋了，请告诉我，我会帮助你摆脱困境，真的，请联系我啦！

China's plan to cut energy intensity by 20 percent and pollutant discharges by 10 percent between 2006 and 2010 is a case in point.

中国计划在2006年到2010间降低20%的能源强度和减少10%的主要污染物排放，就是一个这样的例子。