A powerful earthquake rocked western Colombia on Monday morning, rattling much of the country and setting off a desperate search for survivors in the rubble of collapsed buildings in several major cities. 周一上午，一场强烈的地震袭击了哥伦比亚西部，震动了该国大部分地区，人们在几座主要城市中倒塌建筑的废墟里急切地寻找生还者。…