Rúguǒ A shì B de zhēnzǐjí, nàme A zhìshǎo quēshǎo B de yí gè yuánsù.
If A is a proper subset of B, then A is missing at least one element of B.
Tips
usage
真 (true/genuine) + 子集 (subset) — the 真 marks 'strict' inclusion, i.e. A ⊊ B. Without 真, 子集 (zǐjí) covers both proper and improper subsets, matching A ⊆ B.
