the last or most difficult challenge or area of exploration
最后或最艰难的挑战或探索领域 (zuìhòu huò zuì jiānnán de tiǎozhàn huò tànsuǒ lǐngyù)
"For many scientists, space remains the final frontier."
"对许多科学家来说，太空依然是最后的边疆。" (duì xǔduō kēxuéjiā lái shuō, tàikōng yīrán shì **zuìhòu de biānjiāng**.)
to speak to someone as if they are less intelligent
able to understand things quickly
to support or to make a copy of important data
very calm and composed
to greet someone very kindly and enthusiastically
someone who loves going to parties
