19. Now almost all mon keys who have never not come into contact with this group do not. Now those monkeys who have never got in touch with the experimental group do not haye the habit( of washing the sweet potato to get rid of the sand 凡是未与这群猴子接触过的其它猴子,现在几乎都不会这 么做 20. We have ruled out tool use and invention as ways of telling animal behavior from human behavior. We didnt regard tool use and invention as ways of telling the difference between animal behavior and human behavior 我们现在已经否定了根据能否使用工具和发明创造来区分动 物和人类行为的方法19. Now almost all monkeys who have never not come into contact with this group do not. ___Now those monkeys who have never got in touch with the experimental group do not have the habit ( of washing the sweet potato to get rid of the sand ). 凡是未与这群猴子接触过的其它猴子,现在几乎都不会这 么做。 20. We have ruled out tool use and invention as ways of telling animal behavior from human behavior. __ We didn’t regard tool use and invention as ways of telling the difference between animal behavior and human behavior. 我们现在已经否定了根据能否使用工具和发明创造来区分动 物和人类行为的方法