例句與造句

1. The nature of Geminga was quite unknown for 20 years after its discovery by NASA's Second Small Astronomy Satellite ( SAS-2 ).
2. During 謌elman s time at METU, his astrophysics group s major projects used data of NASA s SAS-II ( Second Small Astronomy Satellite ) gamma ray telescope.
3. It's difficult to find second small astronomy satellite in a sentence. 用second small astronomy satellite造句挺難的