You include with the post form a visual test of some sort that's easy for most people but tricky for a robot.

做法是在post表单包含某种可视测试，这种测试对人而言很容易，对机器人程序而言则很复杂。

youdao

Conduct visual test for the operators every half year.

对操作工每半年进行视力检查。

youdao

Conduct visual test for the operators every half year.

对操作工每半年进行视力检查。

youdao