thermosphereWiktionary 原文构词拆分thermo-前缀Thermal: of, being, or pertaining to heat or temperature.+-sphere后缀(mathematics) Sphere of a certain dimensionality. · Spherical object.词源说明From thermo- + -sphere.释义（英文）名词 NounThe layer of the Earth's atmosphere directly above the mesosphere and directly below the exosphere.词族派生词（1）thermospheric