例句與造句

1. By definition , interplanetary travel is travel between bodies in a given star system
   星系旅行是指在給定的行星系統內在不同星體間的旅行。
2. Scientists are now planning to build a transfer station at l1 between the earth and the moon as the starting point to reach for more remote planets . if successful , interplanetary travel may no longer be a distant dream
   科學家正考慮，在未來的日子，首先在地月之間的l1點興建永久的中轉站，成為往后前往各行星旅程的起點，那么，到太陽系旅行，就不再是夢想了。
3. It's difficult to find interplanetary travel in a sentence. 用interplanetary travel造句挺難的