used when you are expressing thanks or asking politely for sth, to show that you are grateful to sb
I'm much obliged to you for helping us.
承蒙相助，本人不胜感激。
I'd be obliged if you would keep this to yourself.
如蒙保守这个秘密，我将感激不尽。
1.施恩于,施惠于;答应...的请求;使满足 (by, with);使感激;给,借 (with)
2.迫使;责成,使负债务
3.做好事,效劳
1.to force someone to do something because it is the law, a rule, or a duty
2.to help someone by doing something that they have asked you to do
1.Politicians facing corruption allegations have been obliged to stand down, and the wheels of justice have been allowed to turn.
面临贪污腐败指控的政客已经辞职下台，正义的车轮重新扭转乾坤。
2.Since he had taken a room in the same hotel with me I was obliged to see them frequently, whether I wanted to or not.
由于菲尔莫在我住的旅馆里租了一个房间，我不得不经常见到他们，不管是不是想见。
3."Knowing that he was vulnerable, " he said, the MoD would have been obliged to make decisions that took into account his condition.
他说，“国防部既然知道他易受伤害”，就有责任考虑过他的状况后作出决定。
4.Either I would make it on the next try or we would be obliged to continue up the route and forfeit the "all free" effort.
我只能再试一次或是被迫跳过这个路线继续往上放弃“allfree”的成就。
5.Perhaps, too, if he had been obliged to be away from home so much , he might have saved the lives of his mother and daughter.
他也总是会觉得如果自己没有离开家那么久，或许他还可以挽留住母亲和女儿的生命。
6.When Pisanio had provided her with her new apparel, he left her to uncertain fortune, being obliged to return to court.
毕萨尼奥不得不回到宫里去，所以他给她置办好新装以后，就让她一个人去碰运气了。
7."It keeps him in good humour, " said she, "and I am more obliged to you than I can express. "
她说：“这样可以叫他精神痛快些，我对你真是说不尽的感激。”
8.We become stuck, like stowaways on a runaway train, obliged to go where a problem seems to be taking us.
我们被困住，就像偷渡者在逃跑的火车上，必须去往问题将发生的地方。
9.Jane was therefore obliged to go on horseback, and her mother attended her to the door with many cheerful prognostics of a bad day.
于是吉英只得骑着另外一匹马去，母亲送她到门口，高高兴兴地说了许多预祝天气会变坏的话。
10.The defence report would have been obliged to reiterate Japan's inconvenient claim to this inconvenient bit of real estate.
防卫报告中不得不重申日本对这一麻烦的不动产的麻烦主张。