什么是组合体?
["\u7531\u4e24\u4e2a\u6216\u4e24\u4e2a\u4ee5\u4e0a\u7684\u57fa\u672c\u51e0\u4f55\u4f53\u6309\u4e00\u5b9a\u7684\u65b9\u5f0f\u7ec4\u5408\u6210\u7684\u7269\u4f53\uff0c\u79f0\u4e3a\u7ec4\u5408\u4f53"]