sifting

例句：

1. 1. The grains were sifted through a sieve to remove the impurities.
   谷物通过筛子来去除杂质。
2. 2. The scientists used a sifter to separate the different types of seeds.
   科学家们使用筛子来分离不同类型的种子。
3. 3. The chef was sifting through the ingredients for the perfect dish.
   厨师正在仔细挑选食材，以制作完美的菜肴。