noun 下载 🔗分享 遗迹沉积层,生物扰动纹层 A sedimentary lamina caused by animal behaviour. Examples : "The geologist pointed to the ancient mudstone and explained that the wavy patterns, now hardened into rock, were actually a spreite formed by burrowing worms millions of years ago. " 地质学家指着古老的泥岩解释说,那些波浪状的纹路,现在已经硬化成岩石,实际上是数百万年前蠕虫钻 burrow 所形成的遗迹沉积层。 geology animal biology 与AI对话词汇游戏阅读练习