1 sentence

1. 由于距离遥远，肉眼很难观测到海王星。

   yóu​yú jù​lí yáo​yuǎn, ròu​yǎn hěn nán guān​cè dào Hǎi​wáng​xīng.

   It is difficult to see Neptune with the naked eye because it is so far away.

   Source: Dong Chinese Dictionary