工人们正在从岩石中开采矿石。

The workers are ___extracting minerals from the rock.

研究人员正在从植物中提取有效成分用于新药开发。

Researchers are ___extracting active compounds from plants for new drug development.

科学家们正在从海水中提取稀有金属。

Scientists are ___extracting rare metals from seawater.