2 sentences

1. 光年不是时间单位。

   guāng​nián bù​shì shí​jiān dān​wèi.

   A light-year is not a unit of time.

   Source: CCMatrix

2. 你在夜间看到的大多数恒星都在离地球几百光年的范围内。

   nǐ zài yè​jiān kàn dào de dà​duō​shù héng​xīng dōu zài lí dì​qiú jǐ bǎi guāng​nián de fàn​wéi nèi.

   Most of the stars you see at night lie within a few hundred light-years of Earth.

   Source: CCMatrix