1.The wait was mercifully brief, little more than an hour.

1.幸好时间很短，不过一个小时多一点。

2.It was a mercifully quick end for those condemned to die.

2.对于那些死犯说，这是一种仁慈快速解脱。

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

3.幸亏有个他解围，把责任包揽下。