A substance added in small amounts to something else to improve, strengthen, or otherwise alter it. 添加劑，添加物少量加入其他物質以使其提高、增強或改變的物質
A material added in small amounts during a chemical or metallurgical process to absorb impurities. 吸氣劑以少量加入化學或冶金過程中用來吸收雜質的物質
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. 摻雜質，摻質劑加入純半導體材料中的少量硼等物質，用於晶體管和二極體中以改變半導體的導電率
