rack rail

例句：

1. 1.The shelves are lined with books and magazines.
   书架上摆满了书籍和杂志。
2. 2.The support beams were made of wood.
   支撑梁是用木头做的。
3. 3. She placed the books on the shelves to keep them organized.
   她把书放在架子上，以便保持整齐。