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请把下面的汉语翻译成一句英文：

迄今为止，中国建设世界一流航空业的目标尚未取得多少实际成效，但这并不是由于缺乏努力：中国正斥巨资研发新机型和建设航空基础设施，计划到2015年建设70座新机场，还有商用喷气式飞机C919，意欲和波音（Boeing）及空中客车（Airbus）的畅销机型相抗衡。

参考答案：

China's goal of building a world-class aviation industry has so far yielded few tangible results, but not for a lack of effort: The country is spending heavily on new aircraft development and aviation infrastructure, with plans for 70 new airports by 2015 and a commercial jet, the C919, meant to compete with best-sellers from Boeing and Airbus.