苦心 (kǔ xīn): Hard work / Painstakingly (Noun, Adverb) — Meaning & Stroke Order

Don't you see the hard work your parents have put into your growth?

The plan she painstakingly designed did not receive a positive response from the team.

Although he has worked hard on research, a breakthrough in this technology still requires more time.

To prepare for this speech, he painstakingly collected materials and practiced repeatedly.