2 sentences for 極 (jí — pole)

1. 磁铁的同极相互排斥。

   cí​tiě de tóng jí xiāng​hù pái​chì.

   Like poles of magnets repel each other.

   Source: Dong Chinese Dictionary

2. 相传女娲炼五色石以补苍天，断鳌足以立四极。

   xiāng​chuán Nǚ​wā liàn wǔ​sè shí yǐ bǔ cāng​tiān, duàn áo zú​yǐ lì sì jí.

   Legend has it that Nüwa smelted five-colored stones to mend the heavens and cut off the legs of a giant turtle to support the four corners of the world.

   Source: Dong Chinese Dictionary