2 sentences

1. 面对这么复杂的问题，我实在没辙了。

   miàn​duì zhè​me fù​zá de wèn​tí, wǒ shí​zài méi​zhé le.

   Faced with such a complex problem, I'm really at my wit's end.

   Source: Dong Chinese Dictionary

2. 我们应当吸取教训，千万不要重蹈覆辙。

   wǒ​men yīng​dāng xī​qǔ jiào​xun, qiān​wàn bù yào chóng​dǎo​fù​zhé.

   We should learn from this lesson and not repeat the same mistake.

   Source: Dong Chinese Dictionary