Of course, river sand ends up somewhere too, the beach.

当然， 河沙也会流到某个地方， 比如海滩。

Simple separation techniques apply to many physical scenarios, like separating cream from milk, extracting water from soil, or even sifting out flecks of gold from river sand.

简单的分离技术适用于许多物理场景，例如从牛奶中分离奶油，从土壤中提取水，甚至从河沙中筛出金粒。

For instance, she said the banning of river sand extraction would inevitably have a knock-on effect for the people and communities who rely on this practice to earn a living.

例如，她说，禁止河沙开采将不可避免地对依靠这种做法谋生的人们和社区产生连锁反应。