beam with overhanging ends

例句：

1. 1. The beam of the light was shining through the window.
   光线从窗户射进来。
2. 2. The beams of the roof are holding up the ceiling.
   屋顶的梁支撑着天花板。
3. 3. The beams of the house were old and worn out.
   房子的梁旧且磨损。