这是他的心血。
This is his painstaking work.
heart's blood; expenditure (for some project); meticulous care
Every character draws itself, stroke by stroke. Then grab the brush: trace it yourself and hear the word when you finish.
Nice writing!
Chinese words snap together like bricks. Every word below shares a character with this one, so you are already halfway to knowing it.
这是他的心血。
This is his painstaking work.
别浪费我们的心血。
Do not waste our hard work.