He married a young lady of Indian extraction.他娶了一位印度裔年轻女子。

In those days, dentistry was basic. Extractions were carried out without anaesthetic.当时, 牙医术还处于初级阶段。拔牙不用麻药。

the extraction of ore矿石的开采

Petroleum engineers plan and manage the extraction of oil.石油工程师对开采石油作出计划并加以管理。

After extraction and distillation, the substance is known as jasmine concrete.经过萃取和蒸馏的物质就是茉莉浸膏。