短語(yǔ)詞組短語(yǔ)be built on sand 不穩(wěn)be built on a slant 筑成傾斜be built on the sand 基礎(chǔ)不牢固be built on a rock 建立在盤石上to be built on sand 是指某事物基礎(chǔ)不穩(wěn)be built on the rock 建立在盤石上 返回 be built on