"Several residents [reported] seeing what appeared to be two aerial explosions, followed by falling object," it said.
文档称：“据报道，几位当地居民都曾目睹两次空中爆炸后飞碟坠毁。”
The counterweight of an aerial piston engine made in American is object of repair technology research in this paper.
以进口某型航空活塞发动机曲轴配重为对象，对其曲轴配重修理进行研究。
The progress of object-oriented modeling on aerial armament test system software has been introduced in details.
详细介绍了对军械测试系统软件进行面向对象建模的过程。
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