I bought some new shoes which are very similar to a pair I used to own.

similar 是形容词，意思是"相似的、类似的"。这个词来自拉丁语 similis，表示"相同的、相像的"。在英语中常用来描述两个事物在特征、外观或性质上很接近但不完全相同的情况。