"Offset trade" simply means that when the government buys an aircraft abroad, it requests that part of the product include technology transfer or use parts produced domestically.
所謂「對沖貿易」，應用在航太工業上，就是政府向外國購買飛機時，可要求將貨款的一部分用於技術轉移或採購由本國生產的零組件等。