During a migration， geese are apt to take tur in the leading position.
During a migration， geese are apt to take tur in the leading position.
一次迁移飞行中往往有几只大雁轮流领飞。
During a migration， geese are apt to take tur in the leading position.
一次迁移飞行中往往有几只大雁轮流领飞。