2 sentences

1. 我宁死不屈。

   wǒ nìng sǐ bù​qū.

   I would rather die than surrender.

   Source: Dong Chinese Dictionary

2. 面对重重困难，他展现出了顽强不屈的意志。

   miàn​duì chóng​chóng kùn​nan, tā zhǎn​xiàn chū le wán​qiáng bù​qū de yì​zhì.

   Facing numerous difficulties, he showed an unyielding will.

   Source: Dong Chinese Dictionary