4 sentences

1. 冬至那天吃了好几个汤团。

   Dōng​zhì nà tiān chī le hǎo​jǐ gè tāng​tuán.

   I ate several sweet dumplings on the Winter Solstice.

   Source: Dong Chinese Dictionary

2. 他在冬至那天吃了好几个汤团。

   tā zài Dōng​zhì nà tiān chī le hǎo​jǐ gè tāng​tuán.

   He ate several sweet rice balls on the winter solstice.

   Source: Dong Chinese Dictionary

3. 在北方，冬至这一天大家通常会吃饺子。

   zài běi​fāng, Dōng​zhì zhè yī tiān dà​jiā tōng​cháng huì chī jiǎo​zi.

   In the North, people usually eat dumplings on the Winter Solstice.

   Source: Dong Chinese Dictionary

4. 古人通过圭表投下的影子来确定冬至和夏至。

   gǔ​rén tōng​guò guī biǎo tóu​xià de yǐng​zi lái què​dìng Dōng​zhì hé Xià​zhì.

   The ancients determined the winter and summer solstices by observing the shadows cast by the gnomon.

   Source: Dong Chinese Dictionary