- Color classification:
- Complete list of synonyms and antonyms must-read ancient poems 80 Chinese pinyin syllables, complete table of punctuation usage, 106 polyphonic characters that are easy to mispronounce, basic knowledge of Chinese characters, 100 common knowledge for primary school students, classification of primary school idioms (part 1) classification of primary school idioms (part 2) multiplication and division of primary school mathematics formulas French Mantra Table English British Standard
- manufacturing enterprise:
- Douban