谁帮我解释下为这里要加逗号啊（英语语法）句子是 The pair boarded a small plane in South Africa and took a six-hour flight to Blue One Runway,a solid-ice airstrip on Atlantic cost of Antarctica.为什么不可以把 Runway 后面的逗号去掉啊考SAT ACT
问题描述：
谁帮我解释下为这里要加逗号啊（英语语法）
句子是 The pair boarded a small plane in South Africa and took a six-hour flight to Blue One Runway,a solid-ice airstrip on Atlantic cost of Antarctica.
为什么不可以把 Runway 后面的逗号去掉啊
考SAT ACT
答
a solid-ice airstrip on Atlantic cost of Antarctica.是 Blue One Runway的同位语，解释作用的，逗号不能去
答
Blue One Runway以a solid-ice airstrip为同位语,
a solid-ice airstrip对前面的Blue One Runway作解释说明,之间通常用逗号停顿、分隔.