secondary row辅助行secondaryadj.次要的；从属的；中等教育的n.副手；次要位置secondary brain vesicle次级脑泡, 二级脑泡secondary triangulation二等三角测量secondary reinforcement次级强化secondary settling tank二次沉淀池secondary heart disease继发性心脏病secondary building unit次级结构单元secondary spermatocytes次级精母细胞secondary water-suply二次供水secondary clarification二次澄清secondary building edge二次界面

1. It was still dark when we reached our destination, a cleft in the head of a great mountain.
   我们到达目的地的时候，天气还很阴暗，我们去的地方是一座高山顶上的一个裂口。