Definition: things that you have not experienced and know nothing about Level: C1
害怕未知是正常的。
It's normal to fear ___the ___unknown.
对未知的渴望激励着许多探索者。
The hunger for ___the ___unknown motivates many explorers.
科学家不断推动未知的边界。
Scientists constantly push the boundaries of ___the ___unknown.
