| 词汇 | optin |
| 释义 | opt-in noun [countable] (often used as an adjective 常用作形容词) 1.the act of choosing to be part of a system or an agreement 决定加入；选择参与 2.(marketing 营销) when the user of a company's website gives their email address so that they can be sent information about particular subjects, products or services 选择性加入（公司网站的用户输入电子邮件地址即可得到有关主题、产品或服务方面的信息） |
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