经过十年努力，部分分析家相信，中国终于开始用上了自己的涡扇发动机，这一先进战机不可缺少的技术。

After decades of effort, some analysts believe, China is finally beginning to use its own turbofan engines, an essential technology for advanced fighters.

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自从歼- 20战机在2011年1月首次试飞以来，这种先进战机的动向就一直受到外界的持续关注。

Since the fighters - 20 aircraft flight in January 2011 for the first time since the trend of advanced fighter jets has been in continuous attention from the outside.

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