convection zone

基本解释

Starting at the outside and going down into the Sun, the zones are the corona, chromosphere, photosphere. convection zone. and finally the core.
从太阳外部开始进入内部这些区域为：光环带、色球带、光球带、对流带，最终为核心带。
The convection zone reaches up to the sun's surface, and makes up 66 percent of the sun's volume but only a little more than 2 percent of its mass.
对流区的范围直达太阳表面，占有太阳体积的66％，但只有太阳质量的2％多一点儿。
Based on the slab caster operation the surface of the roller is divided into three zones, they are: heat conduction zone, convection zone and the radiation convection zone.
根据连铸机辊子的实际工作情况，将其内外表面分成传导传热区、对流换热区和辐射—对流综合换热区。