例句與造句

1. in the future, scientists could place experimental packages on the lunar surface or on interplanetary trajectories for several years before returning them to earth for laboratory analysis
   科學家未來可將實驗設備設置于月球表面或行星之間的軌道上，幾年后再取回地球，進行實驗室分析。
2. It's difficult to find interplanetary trajectory in a sentence. 用interplanetary trajectory造句挺難的