ad in的用法和样例：
例句
- A material added in small amounts during a chemical or metallurgical process to absorb impurities.
吸气剂以少量加入化学或冶金过程中用来吸收杂质的物质 - A substance, such as boron, added in small amounts to a pure semiconductor material to alter its conductive properties for use in transistors and diodes.
掺杂质，掺质剂加入纯半导体材料中的少量硼等物质，用于晶体管和二极管中以改变半导体的导电率
