asthenosphereWiktionary 原文构词拆分astheno-前缀(anatomy) asthenia; weakness+-sphere后缀(mathematics) Sphere of a certain dimensionality. · Spherical object.词源说明From astheno- + -sphere.释义（英文）名词 Noun(geology) A portion of the Earth's upper mantle, below the lithosphere.词族派生词（1）asthenospheric