在身份验证或检验环境中使用击键力学的挑战是把可接受的变化与不正确的凭证辩别开来。
The challenge in using keystroke dynamics in an authentication or verification context is to discern acceptable variations from incorrect credentials.
新开发方案直到开发周期的末期，才会在目标环境中检验。
New development is not checked against the target environment until late in the development cycle.
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