1 sentence

1. 1937年，他在地面上测试了他的第一架喷气发动机。

   1937 nián, tā zài dì​miàn shang cè​shì le tā de dì​yī jià pēn​qì​fā​dòng​jī.

   In 1937, he tested his first jet engine on the ground.

   Source: CCMatrix