当用户输入密码得到的反馈却是一行星号的时候，可用性受损了。
Usability suffers when users type in passwords and the only feedback they get is a row of bullets.
输入域。供用户提供反馈。包括文本输入框、密码输入框、多选框、单选框和滑块等。
Input fields Input fields enable users to provide feedback. They include text fields, password fields, check boxes, radio buttons, sliders and more.
初步分析表明，信息反馈流密码体制具有较高的安全性。
The primary analysis shows that the stream ciphers with information feedback are of high...
初步分析表明，信息反馈流密码体制具有较高的安全性。
The primary analysis shows that the stream ciphers with information feedback are of high...
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