Mercifully some one arrived upon the scene to extricate him from the dilemma and assume the responsibility.是什么意思？

Mercifully some one arrived upon the scene to extricate him from the dilemma and assume the responsibility.

幸亏有个人来替他解围,把责任包揽下来.

mercifully

adv. 幸运地，宽厚地，仁慈地；

例句
The exhibition is informative, up to date, and mercifully free of gimmicks.
这个展览既能让人增长见识，又紧跟时代前沿，而且幸运的是没有华而不实的东西。

some

det. 一些，某个，部分，相当多的；pron. 一些，若干，（数量不确切时用）有些人；adv. 大约，有点，稍微；

例句
It's not a question of some abstract concept.
这不是某个抽象概念的问题。

one

num. （数字）一，一个，（基数）一，第一；n. 一个人，一点钟，一体，独一；pron. 一个人，任何人，本人，人家，东西；adj. 某一个的，一体的，一方的；

例句
No one ever questioned her capability.
从来没有人质疑她的能力。

arrived

v. 到达，来( arrive的过去式和过去分词 )，发生；

例句
...a bundle of letters which had arrived for me in my absence...
我不在期间寄给我的一大堆信件

upon

prep. 在…上面，当…时候；

例句
...the doctrine of absolute monarchy based upon divine right.
以神权为基础的君主专制学说

the

art. 指已提到的人（物），指说话人与听者已知的人（物），用于独一无二的事物前，与形容词最高级和序数词连用；

例句
He did have a real knowledge of the country...
他对该国的确知之甚多。

scene

n. 场面，现场，（戏剧的）一场，景色，风景，事件；

例句
We had to do the scene over and over again, from different angles...
我们不得不翻来覆去地从不同的角度拍这个场面。

to

prep. 向，朝着，到，关于，属于；adv. 朝一个方向的，到某种状态，关闭；

例句
I suggest you leave it to an expert...
我建议你把它留给专家来解决。

extricate

vt. 使摆脱困难，脱身；n. 解脱，解脱者；

例句
It represents a last ditch attempt by the country to extricate itself from its economic crisis...
那是该国摆脱经济危机的最后一搏。

him

pron. (he的宾格)他；

例句
They said goodbye to him as he got aboard the train at Union Station.
当他在联合火车站登上火车之际，他们向他道别。

from

prep. （表示时间）从…，（表示原因）因为，（表示来源）来自…，（表示分离）与…分离[隔开]；

例句
...an abortive attempt to prevent the current President from taking office.
企图阻止现任总统连任的失败尝试

dilemma

n. 窘境，困境，进退两难；

例句
He was faced with the dilemma of whether or not to return to his country...
要不要回国，他进退两难。

and

conj. 和，与，而且，于是，然后，因此；

例句
I spend a lot on expensive jewelry and clothing...
我花很多钱购买昂贵的首饰和衣服。

assume

v. 假定，认为，承担，装出，呈现；

例句
It is a misconception to assume that the two continents are similar...
关于这两块大陆相似的假设是一种误解。

responsibility

n. 责任，职责，责任感，责任心，负责任；

例句
Many parents simply abdicate all responsibility for their children.
许多父母对孩子简直是完全撒手不管。