5 sentences for 关系 (guān​xì — to concern)

1. 这件事关系切身利益。

   zhè jiàn shì guān​xì qiè​shēn lì​yì.

   This matter concerns one's vital interests.

   Source: Dong Chinese Dictionary

2. 一次失败没关系，千万别泄气。

   yī cì shī​bài méi guān​xì, qiān​wàn bié xiè​qì.

   One failure doesn't matter; don't lose heart.

   Source: Dong Chinese Dictionary

3. 这件事情关系重大，万万不可外泄。

   zhè jiàn shì​qing guān​xì zhòng​dà, wàn​wàn bù kě wài xiè.

   This is a matter of great importance and must never be leaked.

   Source: Dong Chinese Dictionary

4. 这事关系重大，我们必须认真对待。

   zhè shì guān​xì zhòng​dà, wǒ​men bì​xū rèn​zhēn duì​dài.

   This is a matter of great importance; we must take it seriously.

   Source: Dong Chinese Dictionary

5. 此案关系重大，处理时务必审之又审。

   cǐ àn guān​xì zhòng​dà, chǔ​lǐ shí wù​bì shěn zhī yòu shěn.

   This case is of great importance and must be handled with extreme caution.

   Source: Dong Chinese Dictionary