xīn​xuè HSK7

painstaking effort

心血 xīn​xuè
painstaking effort
Metaphorical heart's blood; specifically, the great care, meticulous effort, or vital energy expended on a task or project
heart's blood
(literary) The blood of the heart, believed to be the seat of one's spirit and vitality

Frequency

Movie subtitles
4.05 per million appears in 2% of films
Written text
6.83 per million

Details

HSK 2.0
Level 6
HSK 3.0
Level 7

Sources