slice and map
slice and map

tao12345666333/Talk-Is-Cheap,tao12345666333/Talk-Is-Cheap,tao12345666333/Talk-Is-Cheap,tao12345666333/Talk-Is-Cheap,tao12345666333/Talk-Is-Cheap,tao12345666333/Talk-Is-Cheap,tao12345666333/Talk-Is-Cheap,tao12345666333/Talk-Is-Cheap,tao12345666333/Talk-Is-Cheap,tao12345666333/Talk-Is-Cheap