以上来源于: WordNet
The US turned the YF-12 into a reconnaissance plane.
美国最终把YF-12改成了侦察机。
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To study teratogenic effects of YF 1 germicide in mice.
探讨YF 1杀菌剂对小鼠的致畸作用。
The effort involved the design, construction and flight testing of two YF-22 prototype aircraft.
努力参与设计，建造和飞行试验两y f - 22原型机。
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