unman nghĩa là gì

• He pointed to two of those concepts — a Theodore Roosevelt presidential library and a statewide network for unmanned aircraft.
  He pointed to two of those concepts (ý tưởng) — a Theodore Roosevelt presidential library (thư viện tổng thống) and a statewide network for unmanned aircraft systems (mạng lưới hệ thống máy bay không người lái toàn bang) — as having “set a high bar."