A substance added in small amounts to something else to improve, strengthen, or otherwise alter it. 添加剂，添加物少量加入其他物质以使其提高、增强或改变的物质
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
