Definition: a hard, natural substance that is found in the ground Level: B1
他们从山坡上切割出巨大的石块。
They cut enormous blocks of ___stone out of the hillside.
孩子们正在向一个木箱扔石头。
The kids were throwing ___stones at a wooden box.
有石头和木头建造的房子。
There are houses made of ___stone and wood.
