They are interesting for the fact that they are very plain and undecorated for the time, with only one plain central panel at the back and no armrests.
出自-2013年12月听力原文
柯林斯高阶英汉双解学习词典释义
N-COUNT
（椅子的）扶手，靠手
The armrests on a chair are the two pieces on either side that support your arms when you are sitting down.