3 sentences

1. 这两根大梁承着屋顶全部的重量。

   zhè liǎng gēn dà​liáng chéng zhe wū​dǐng quán​bù de zhòng​liàng.

   These two main beams support the entire weight of the roof.

   Source: Dong Chinese Dictionary

2. 房顶的大梁是用坚固的松木制成的。

   fáng​dǐng de dà​liáng shì yòng jiān​gù de sōng​mù zhì​chéng de.

   The main beam of the roof is made of solid pine wood.

   Source: Dong Chinese Dictionary

3. 老屋的房梁上还悬着一盏沾满灰尘的旧油灯。

   lǎo​wū de fáng​liáng shàng hái xuán zhe yī zhǎn zhān​mǎn huī​chén de jiù yóu​dēng.

   An old oil lamp covered in dust still hangs from the beam of the old house.

   Source: Dong Chinese Dictionary