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/ˌkɒmbɪnəˈtɒrɪks/
组合数学；组合学
The 🔊 course 🔊 in 🔊 combinatorics 🔊 is 🔊 quite 🔊 challenging 🔊 but 🔊 also 🔊 very 🔊 rewarding 🔊 .
这门组合数学课程非常具有挑战性，但也很有收获。
The course in combinatorics is quite challenging but also very rewarding.
