noun 下载 🔗分享 地堑,地沟 An elongated block of the Earth's crust, bounded by faults, that has dropped relative to the surrounding area. Examples : "The geologist pointed out the grabens visible in the valley floor, explaining how they formed when the land between the faults sank downwards. " 地质学家指出了山谷底部可见的地堑,并解释说,当断层之间的土地向下沉降时,这些地堑就形成了。 geology geography environment place area 与AI对话词汇游戏阅读练习