表达 “build something on sand” 用 “在沙子上建造某物” 来比喻 “事物基础薄弱或没有基础”。 虽然它可以描述 “建筑物等有形的事物根基不稳固”，但往往多用来指 “论点或想法毫无根据”，多用于被动语态中，即 “be built on sand”。

We depend on the Hackaday community to help us find all the fresh hacks the Internet has to offer. Whenever you see something you think should be discussed on Hackaday we want to hear from you. This ...