Through his research, Nielsen has come to the conclusion that using nondescript bullets to cover up password characters violates an important usability principle, that of providing sensory feedback.

• 在其研究中，尼尔森得出结论 -- 使用难以区分的星号盖住密码字符违背了可用性的一项重要原则，即提供感觉反馈原则。