The Cave-dweller Era The era that most people think of when they talk about "cavemen" is the Paleolithic Era, sometimes referred to as the Stone Age (it's actually one part of the Stone Age). It extends from more than 2 million years into the past until sometime between 40,000 and ...
a cave dweller especially of the Stone Age a man who acts in a rough or crude manner cave man词源英文解释 The first known use of caveman was in 1865 cave man儿童词典英英释义 cell membranenoun a semipermeable outside layer surrounding the contents of a cell ...