1. Space exploration is still in its infancy.
   宇宙探索仍处于初级阶段
2. Men venture their lives in space exploration.
   人们冒着生命危险从事太空探索。
3. The exploration involves danger.
   那项探险必然带有危险。
4. Arctic exploration;exploration of new theories.
   北极探险;新理论的探索
5. Spain began the exploration of the New Word.
   西班牙开始了对新世界的探索。

　3个名词解释