Official guardian of celestial terminology the IAU may be.

天体术语的官方捍卫者可能还得由国际天文学会来担当。

The IAU decides the official names of all celestial bodies.

这一联合会确定所有天体的官方名称。

I could be little tired by IAU world championship, but I would give my best.

参加IAU世界冠军赛让我有一点疲惫，但我会全力以赴。

Since there are so many stars in the universe, the IAU USES a different system for newfound stars.

由于宇宙中有太多恒星了，所以IAU还使用了另一套不同的系统命名新发现的恒星。

In the case of defining a planet, IAU made the call, and "now we have to use this definition and try to play the game."

在定义行星这点上，IAU给了行星一个说法，“现在我们就要使用这个定义来完这场游戏了”。