noun 下载 🔗分享 地堑,断陷谷 An elongated block of the Earth's crust, bounded by faults, that has dropped relative to the surrounding area. Examples : "The valley, a distinct graben, formed over millions of years as the land on either side slowly rose. " 这个山谷是一个明显的地堑(断陷谷),经过数百万年的时间,两侧的陆地缓慢抬升而形成。 geology geography environment 与AI对话词汇游戏阅读练习