例句與造句

1. Dr . Edward Weiler, head of space science at NASA, said nuclear generators were necessary for outer planet missions, where sunlight is faint.
2. Hartman has spoken both domestically and internationally at innumerable press events, including serving as the NASA press interface for many outer planets missions and launches.
3. It's difficult to find outer planets mission in a sentence. 用outer planets mission造句挺難的