| 可选 | kě xuǎn | available / optional |  |
| 自选 | zì xuǎn | to choose by oneself / free to choose / optional / self-service | |
| 选装 | xuǎn zhuāng | optional (equipment) | |
| 选修课 | xuǎn xiū kè | optional course (in school) | |
| 残疾人权利公约任择议定书 | | Optional Protocol to the Convention on the Rights of Persons with Disabilities | |
| 附加气象辅助终端 | fù jiā qì xiàng fǔ zhù zhōng duān | meteorological optional auxiliary terminal | |
| 关于能源援助的任择议定书 | | Optional Protocol Concerning Energy Assistance | |
| 关于强制解决争端的任择议定书 | | Optional Protocol concerning the compulsory settlement of disputes | |
| 消除对妇女一切形式歧视公约任择议定书 | | Optional Protocol to the Convention on the Elimination of All Forms of Discrimination against Women | |
| 根据任择议定书提出的来文工作组 | | Working Group on Communications under the Optional Protocol to the Convention on the Elimination of All Forms of Discrimination against Women / Working Group on Communications under the Optional Protocol | |
| 特派使团信使和邮袋地位第一任择议定书 | | Optional Protocol One on the Status of the Courier and the Bag of Special Missions | |
| 取缔伪造货币任择议定书 | | Optional Protocol regarding the Suppression of Counterfeiting Currency | |
| 人权委员会不限成员名额工作组 | | Open-ended Working Group of the Commission to examine the question of a draft optional protocol to the International Covenant on Economic, Social and Cultural Rights | |
| 儿童权利公约两项任择议定书 | | Optional Protocols to the Convention on the Rights of the Child | |
| 备选安全办法 | | optional security provision | |
| 任择性声明 | | optional declaration | |
| 公民及政治权利国际公约任择议定书 | | Optional Protocol to the International Covenant on Civil and Political Rights / First Optional Protocol to the International Covenant on Civil and Political Rights | |
| 关于强制解决争端的任择签字议定书 | | Optional Protocol of Signature concerning the Compulsory Settlement of Disputes | |
| 国际组织和国家间仲裁任择规则 | | Optional Rules for Arbitration Involving International Organizations and States | |
| 仲裁两国间争端的任择规则 | | Optional Rules for Arbitrating Disputes between Two States | |
| 任择议定书 | | optional protocol | |
| 任择条款 | | optional clause | |
