flee escape evade avoid的区别

To escape is to succeed in keeping away from danger, pursuit, observation, etc.:
指成功逃避了危险，追捕等
to escape punishment.

To elude implies baffling pursuers or slipping through an apparently tight net:
指与追捕者周旋并避开了陷阱
The fox eluded the hounds.

To evade is to turn aside from or go out of reach of a person or thing:
指避开某人或者某件事情
to evade the police.

To avoid is is to succeed in keeping away from something dangerous or undesirable:
指成功避开危险或者不希望发生的事情
to avoid meeting an enemy.
I tried to avoid meeting him, but somehow bumped against him.

To flee is to run away from (a place, person, etc.).
指离开某个地方或是逃离某人
He killed his enemy and fled the country.