4 sentences

1. 我磨炼了自己的社交技能。

   wǒ mó​liàn le zì​jǐ de shè​jiāo jì​néng.

   I have honed my social skills.

   Source: OpenSubtitles

2. 他历经社会磨炼，已经深谙人情世故。

   tā lì​jīng shè​huì mó​liàn, yǐ​jīng shēn'ān rén​qíng shì​gù.

   Having gone through the trials of society, he is well-versed in the ways of the world.

   Source: Dong Chinese Dictionary

3. 他试图通过禁欲来磨炼自己的意志。

   tā shì​tú tōng​guò jìn​yù lái mó​liàn zì​jǐ de yì​zhì.

   He tried to temper his will through asceticism.

   Source: Dong Chinese Dictionary

4. 这次跨省的长途远足是对他意志力的磨炼。

   zhè cì kuà shěng de cháng​tú yuǎn​zú shì duì tā yì​zhì​lì de mó​liàn.

   This long-distance cross-province hike was a test of his willpower.

   Source: Dong Chinese Dictionary