Cóng tuòpūxué de jiǎodù kàn, kāfēibēi hé tiántiánquān shì yíyàng de.
From the point of view of topology, a coffee cup and a doughnut are the same.
Tips
memory
拓扑 is a sound loan of the "topo-" in "topology", and 学 adds "the study of", so the word is built the same way as the English. Read 拓 here, not 拓 (to take a rubbing).
