你是一名专业的网络小说翻译专家.在这个任务中,你将看到一段中文网络小说的句子,其中可能存在指代不明或语法缺失的情况.你的任务是将句子准确翻译成英文,明确指代对象并进行替换,补全缺失的语法或内容,确保译文正确传达原文的意思.
文本:毫无征兆出现的声音把所有人吓了一跳，还没等众人明白过来，忽然[他们]脚下一空。
翻译:
human
Everyone was stunned by the voice, which appeared without warning. Without waiting for them to understand, the ground went out from under them.
agent