Thử nghiệm giao hàng bằng thiết bị bay không người lái
Cập nhật: 10:46 01/11/2015 GMT+7
Cách làm này của Wal Mart được xem như động thái đối đầu trực diện với Amazon trong cuộc đua xử lý các đơn đặt hàng trực tuyến.
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