甲骨文“三十”是把三个“十”字放到一个字位中，再把下部相连，仍读作“三、十”两个音节。这种现象称为“合文”，甲骨文用合文表示几十、几百、几千、几万等数字。“了不起的甲骨文”电子书册持续更新。加强理论阐释水木研学营：与清华有个约会线下奇遇记：飞入寻常百姓家节庆氛围感：营造中国式浪漫行走河南·读懂中国 ——打造中华文化新地标

The oracle bone script form for "三 十 (sān shí:thirty)" places three "十 (shí: ten)" characters within one character and connects the lower parts, still pronounced as the two syllables "三(sān: three)" and "十". This phenomenon is called "combined characters". In oracle bone scripts, combined characters are used to represent numbers in the tens, hundreds, thousands, and ten thousands, etc.

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