这已经不是首次实验室制造的气管被用于移植。
This is not the first time a lab-engineered trachea has been used for transplantation.
本文首次将底部排气法应用于导弹上，结合一种具有常规气动布局的超声速导弹进行了底部排气方案设计，采用一种“底窝器”来提高进气道整流罩的底部压强，并进行了风洞实验验证。
Then, the base bleed method is introduced on a general supersonic missile to decrease the base drag of the inlet cowl for the first time and is validated by wind tunnel test.
将自然拼读法首次应用于艺术类院校大学英语教学中，通过实验及测试，运用定量分析的方法，对自然拼读法在大学英语词汇教学中的应用问题进行研究。
Applying Phonics teaching Method into the English teaching of Art College students for the first time, the author makes a study through experiments and tests by the way of quantitative analysis.
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