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| Chinese | English |
| 第三产业部门 | tertiary sector The part of a country or region's economy that produces services or assets lacking a tangible and storable form (一个国家或地区经济的一部分，生产服务或资产缺乏有形的和可存储的形式。) |
| 第三保护机制 | third protective mechanism |
| 第三族元素 | element of group Group III consists of two subgroups: group IIIb and group IIIa. Group IIIa consists of scandium, yttrium, and lanthanium, which is generally considered with the lanthanoids, and actinium, which is classified with the actinoids. Group IIIb, the main group, comprises boron, aluminium, gallium, indium, and thallium (第三族元素，包含两个子族：3b和3a族。3a族包含通常被归为镧系的钪、钇、镧和是属于辐射性元素的锕。3b族包含硼、铝、镓、铟、铊。) |