B??c 3: Gi?i thi?u 123B th??ng cung c?p nhi?u phiên b?n c?a ?ng d?ng, phù h?p v?i các h? ?i?u hành khác nhau nh? Android ho?c iOS. The skis worked each on snow and water, as well as the process proficiently authorized the plane to land on h2o, land, snow or ice.