Read Edit View history 真子集 zhēnzǐjí proper subset Origin Definitions Defs Strokes Stroke Words Sentences Sents created sense approved 真子集 · zhēnzǐjí · proper subset 2026/03/04 真子集 zhēnzǐjí proper subset proper subset 集合A是集合B的真子集。 noun created sense Mar 4, 2026, 02:25 AM