Read the following passage and answer questions:A recent investigation by scientists at the U.S. Geological survey shows that strange animal behavior might help to predict future earthquakes. Investigators found such occurrences in ten kilometer radius of the epicenter of a fairly recent quake. Some birds. screeched and flew away wildly; dogs yelped and ran around uncontrollably. Scientists believe that animal can perceive these environmental changes as early as several days before the mishap. In 1976, after observing animal behavior, the Chinese were able to predict a devastating earthquake. Although hundreds of thousands of people were killed, the Government was able to evacuate millions of other people and thus keep the death toll at a lower level.In this passage the word 'evacuate' means ___.