2 sentences for 炉 (lú — furnace)

1. 废铁被投入炼钢炉中熔化。

   fèi​tiě bèi tóu​rù liàn​gāng lú zhōng róng​huà.

   Scrap iron was put into the steel furnace to melt.

   Source: Dong Chinese Dictionary

2. 传说太上老君的炉里炼出了一颗神丹。

   chuán​shuō Tài​shàng Lǎo​jūn de lú lǐ liàn​chū le yī kē shén​dān.

   Legend has it that a divine elixir was refined in Taishang Laojun's furnace.

   Source: Dong Chinese Dictionary