A robotic system comprising: a vehicle comprising: a plurality of wheels; a driving assembly; a platform; a robot mounted on the platform of the vehicle; a first removable rack mounted on the platform of the vehicle; wherein the wheels are under the platform; and wherein the driving assembly is installed in the front of the platform; and wherein the vehicle is to move on the ground; and wherein the robot is to pick up the first removable rack to or from the platform; and wherein the robot is to pick up the items on the first removable rack; characterized by the fact that the robotic system further comprises a second removable rack mounted on the platform of the vehicle; wherein the first removable rack is closer to the driving assembly than the second removable rack; and wherein the robot is between the first removable rack and the second removable rack; wherein the robot is a fork-shaped lifter comprising a base rotatable about a first direction, the base comprising a first slot (372, 472) and a second slot (374, 474) parallel to the first slot (372, 472), the first slot (372, 472) being perpendicular to the first direction; a first pole (262, 462) translating along the first slot (372,472) a second pole (264, 464) translating along the second slot (374, 474); a frame translating along the first direction, the frame being directly mounted on the first pole (262, 462) and the second pole (264, 464); a first fork prong directly mounted on the frame; and a second fork prong directly mounted on the frame, the second fork prong being parallel to the first fork prong; wherein a width between the first fork prong and the second fork prong is adjustable. a plurality of wheels; a driving assembly; a platform; a robot mounted on the platform of the vehicle; a first removable rack mounted on the platform of the vehicle; wherein the wheels are under the platform; and wherein the driving assembly is installed in the front of the platform; and wherein the vehicle is to move on the ground; and wherein the robot is to pick up the first removable rack to or from the platform; and wherein the robot is to pick up the items on the first removable rack; characterized by the fact that the robotic system further comprises a second removable rack mounted on the platform of the vehicle; wherein the first removable rack is closer to the driving assembly than the second removable rack; and wherein the robot is between the first removable rack and the second removable rack; wherein the robot is a fork-shaped lifter comprising a base rotatable about a first direction, the base comprising a first slot (372, 472) and a second slot (374, 474) parallel to the first slot (372, 472), the first slot (372, 472) being perpendicular to the first direction; a first pole (262, 462) translating along the first slot (372,472) a second pole (264, 464) translating along the second slot (374, 474); a frame translating along the first direction, the frame being directly mounted on the first pole (262, 462) and the second pole (264, 464); a first fork prong directly mounted on the frame; and a second fork prong directly mounted on the frame, the second fork prong being parallel to the first fork prong; wherein a width between the first fork prong and the second fork prong is adjustable.