Their love was built on the sand,that is why their marriage has landed on the rocks.

他们的爱情缺乏坚实的基础，这就是他们的婚姻濒临破裂的原因所在。

这条习语的字面意思是"把......建筑在沙土地上"，喻指"基础不牢固"或"不切实际"，常用于口语之中。比如：I hear he decided to invest in a film;it is built on the sand. 我听说他要投资拍电影，这太不切实际了。
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