单词oceanic ridge
un.: 大洋脊网络: 洋底脊；洋中脊；海岭
大洋脊
Fig. 5 The oceanic ridge and trench: a spoke trench b annual ring trench c small isolated mountain d huge annual ring trench
图5，海岭与海沟：a轮辐海沟；b年轮海沟；c小孤山；d巨年轮海沟。