其中一个是联邦航空管理局在2004年批准的新型娱乐性飞行器。
One was the new category of recreational aircraft the FAA sanctioned in 2004.
STL文件因其简单和通用性好，一直作为快速成型领域的准标准。
STL is the criterion in rapid prototyping field because of its simpleness and currency.
根据这一结论改进空气卷吸率计算模型，很大程度上改善了准维模型对瞬变工况的适应性。
According to this conclusion, the air entrainment model and the robustness of quasi-dimensional model has been improved to some extent.
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