chair arm plate

例句：

1. 1.The chair arm plate is a small piece of wood that sits on the back of a chair to protect the user's back.
   椅子扶手板是一块小木头，放在椅子的背部上，用来保护使用者的背部。
2. 2. The chair arm plate was designed to provide extra support for people who sit for long periods of time.
   椅子扶手板的设计是为了为长时间坐着的人提供额外的支撑。
3. 3. The chair arm plate was a popular accessory for office workers, providing comfort and support for their backs.
   椅子扶手板是办公室工作人员的热门配件，为他们提供了舒适和支持，以保护他们的背部。