沉积: [地] deposit; sedimentation; deposition; precipitation 短语和例子陆相沉积 continental deposit; 海相沉积 marine deposit; 河口沉积了淤泥。 the river deposited silt at its mouth. 尼罗河泛滥时, 在田野上沉积下一层泥。 when the nile
边缘: 1.(沿边的部分) border; edge; fringe; margin; rim; limb; skirt; verge; brink; periphery 短语和例子经济破产的边缘 the verge of economic bankruptcy; 悬崖的边缘 the edge of a precipice; 森林的边缘 the fringe of a forest
