3 sentences

1. 股指今日突破了三千点大关。

   gǔ​zhǐ jīn​rì tū​pò le sān​qiān diǎn dà​guān.

   The stock index broke the 3,000-point mark today.

   Source: Dong Chinese Dictionary

2. 该公司的年产值终于突破了亿元大关。

   gāi gōng​sī de nián chǎn​zhí zhōng​yú tū​pò le yì yuán dà​guān.

   The company's annual output value finally broke the 100 million yuan mark.

   Source: Dong Chinese Dictionary

3. 这种叫作大关的刑具，现在的人们已经很难见到了。

   zhè zhǒng jiào​zuò dà​guān de xíng​jù, xiàn​zài de rén​men yǐ​jīng hěn nán jiàn​dào le.

   This type of torture instrument called the 'Daguan' is rarely seen by people today.

   Source: Dong Chinese Dictionary