《汉书·志·律历志下》
岁中：十二；用三统数乘四时数，得岁中数。
岁中十二。以三统乘四时，得岁中。
Year center: 12; multiply the three unified number by the four seasons number, to get the year center number.
<s>[INST] Transpose the following Modern Chinese text into Classical Chinese: 岁中：十二；用三统数乘四时数，得岁中数。 [/INST] 岁中十二。以三统乘四时，得岁中。</s>
Transpose the following Modern Chinese text into Classical Chinese: 岁中：十二；用三统数乘四时数，得岁中数。
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岁中十二。以三统乘四时，得岁中。
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