定的带负电荷交换基 negatively charged: 带负电的; 带负电荷的; 带阴电荷的fixed ion exchange site: 固定的离于交换基negatively charged electron cloud: 负电荷电子云negatively charged ion: 负电性离子; 阴离子negatively charged ion generator: 负带电离子发生器下载手机词典可随时随地查词查翻译