Two weeks later, Mickey left a letter from the bank on our steps.
两周后，米基在我们家台阶上留下一封银行寄来的信。
This just means that the program checked if a situation was OK, then later used that information, but an attacker can change the situation between those two steps.
这只说明了程序检查某种情形是否可行，然后稍后使用那一信息，但是攻击者可能会在这两个步骤之间改变该情形。
Decades later, Pevekar can't climb more than two flights of steps.
十年后，佩卡尔甚至无法爬完两段以上的楼梯。
Lavrov later said it was "absolutely necessary" to avoid steps that could further harm relations between the two countries.
拉夫罗夫先生后来表示，避免进一步伤害两国之间关系是绝对有必要的。
Lavrov later said it was "absolutely necessary" to avoid steps that could further harm relations between the two countries.
拉夫罗夫先生后来表示，避免进一步伤害两国之间关系是绝对有必要的。
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