在这种测试内，您给出的是一个代表某种数字符号的图像，用户必须读懂并在表单字段内输入这些符号。

In this test you present an image representing some alphanumeric characters that the user must read and type into a form field.

youdao

下面的符号名称可以被识别为合法的对照元素名称，对于单字符的补充，你可以下面这样写。

The following symbolic names are recognised as valid collating element names, in addition to any single character, this allows you to write for example.

youdao