planetologists怎么读，planetologists什么意思，planetologists短语和例句

1.Planetologists believe comets are the oldest relics in the solar system.

行星学家们认为，彗星是太阳系中最古老的残余物。

2.Planetologists believe comets are the oldest relics in the solar system.

行星学家们认为，彗星是太阳系中最古老的残余物。