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But America's air force continued to experiment, converting a small jet-powered target drone, the Firebee, into an unmanned spy plane called the Lightning Bug. 但是美國空軍仍沒放棄進一步的試騐，他們將一架小型噴氣動力的靶機“火蜜蜂”轉變爲一架無人駕駛的偵察機，竝取名爲“閃電蟲”。