pump screen

例句：

1. 1. The pump is essential for maintaining water levels in the reservoir.
   泵对于保持水库水位至关重要。
2. 2. The sieve was used to separate grains from the flour.
   筛子被用来将谷物与面粉分离。
3. 3. The filter removes impurities from the water before it reaches the tap.
   过滤器在水到达水龙头之前去除杂质。