hypocone

例句：

1. 1. The hypocone is the center of a rotating magnetic field.
   假极性是旋转磁场的中心。
2. 2. The polarity of this material is determined by its chemical composition.
   这种材料的极性由其化学成分决定。
3. 3.Hypotheses are often used to explain why phenomena occur.
   假设常被用来解释现象发生的原因。