VOA慢速英语:Is There a Ninth Planet in Our Solar System?

短语讲解：

1. They want to find out more about “Planet Nine’s” orbit, and its impact on the outer part of our solar system.

find out 发现; 使发作
例句：I'll find out the address,and ring you back.
我找到地址后再与你通电话。

2. They say that this new planet is so large that there should be no doubt that it is a true planet, once they confirm it.

no doubt 固然; 无疑地; 很可能
例句：I have no doubt of their being happy together.
我不怀疑他们在一起的快乐。

3. At the moment it’s simply a prediction.

at the moment 当时; 此刻，现在
例句：Our chief concern at the moment is the weather.
眼前我们最关心的事是天候。