n.航空；飛機制造業(yè)

At that time aviation was still in its infancy. 當(dāng)時航空仍在萌芽階段。

Jets are a new development in aviation. 噴氣式飛機是航空事業(yè)上的一個新成就。

In old China,there was hardly any machine- building industry,to say nothing of automobile and aviation industries. 舊中國幾乎沒有機器制造業(yè)，更不用說汽車制造業(yè)和飛機制造業(yè)了。