?键次验证
... single key stroke 单键击打 alternate key stroke 交错击键法 ; 交替击键 key stroke verification 键次验证 ...
New forms of student verification are being developed and include such things as retinal scanning, electronic fingerprinting, and key stroke analysis.
FORBES: The Myths of Online Learning
英汉双解词典包含3185865条英汉词条，基本涵盖了全部常用单词的翻译及用法，是英语学习的有利工具。