即使对于最快的打字者来说，某些特定击键也很难实现 0.02 秒的重复精度，在知道正确的密码字符后就更不用进行猜测了。
Repeatable precision of 20 one-thousandths of a second for specific keystrokes is difficult for even the fastest typists to mimic, much less guess even when the correct password characters are known.
击键记录者是特别危险的安全威胁，因为他们即使存在，安全记录危险用户通常也没有察觉到。
Keystroke loggers are a particularly dangerous security threat because users typically don't realize they're even there.
那些击键记录者有可捕捉一年或者更少的输入的内放内存芯片。
These keystroke loggers have built-in memory chips that can capture a year or more of typing.
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