a work embodying one’s utmost effort ❍ 他的伟大作品远近驰名，但他的～却不大为人知晓。His great works are well-known far and wide,but little is known of the great pains he has taken.
良工心苦liánɡ ɡōnɡ xīn kǔ
良工：手艺精良的工匠。指优秀艺术家的好作品都经过一番苦心创造。a work embodying one’s utmost effort, great pains