How does 划词翻译 use multiple keys for translation services?

划词翻译 will try the keys in the order they are filled in. When the first key fails, 划词翻译 will move this failed key to the end of the key list and try the next key, and so on.

The purpose of this design is to hope that when the free quota of the first key is used up, if the translation service fails because of this, 划词翻译 will automatically use the second key.

However, please note: some services will not fail after the free quota is used up, and will continue to charge. For details, please refer to the "Price" section in the application steps of each service. If it does not fail, then even if you fill in multiple keys, 划词翻译 will always use the first one.