矿筛

例句：

1. 1. The engineer used a mesh screen to separate the sand from the gravel.
   工程师使用网状筛将沙子从砾石中分离出来。
2. 2. The gold prospector had to sift through a mountain of dirt to find the precious metals.
   淘金者必须翻遍一堆堆的泥土才能找到珍贵的金属。
3. 3. The grain separator is designed to separate the wheat kernels from the chaff.
   谷物分离机被设计用来将麦粒和麦壳分开。