新概念三thirteen equals one一课的问题
Looking at his watch,he saw that it was one o'clock,but the bell stuck thirteen times before it stopped.Armed with a torch,the vicar went up into the clock tower to see what was going on.……为什么一开始用现在分词Looking开头,后面又用过去分词Armed with a torch.请高手讲讲这两个分词做句首的用法吧～