2 sentences

1. 弹指一挥间，他已经度过了一个甲子。

   tán​zhǐ yī huī jiān, tā yǐ​jīng dù​guò le yī gè jiǎ​zǐ.

   In the blink of an eye, he has lived through a full sixty-year cycle.

   Source: Dong Chinese Dictionary

2. 史书上记载，那次起义爆发于甲子年。

   shǐ​shū shàng jì​zǎi, nà cì qǐ​yì bào​fā yú jiǎ​zǐ nián.

   Historical records state that the uprising broke out in the Jiazi year.

   Source: Dong Chinese Dictionary