他们改良了土壤。
They improved the soil.
to improve (sth); to reform (a system)
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.
他们改良了土壤。
They improved the soil.
这个品种需要改良吗?
Does this variety need improving?