toroidal core

例句：

1. 1.The toroidal core of the planet is a fascinating feature.
   行星的环形核是一个令人着迷的特征。
2. 2. The toroidal core of the star is responsible for its intense magnetic field.
   恒星的环形核负责其强烈的磁场。
3. 3.The toroidal core is made up of a thick layer of gas and dust.
   环形核由一层厚厚的气体和尘埃组成。