在2007年阐明的一个名词中，该词首倡者、投资人Nassim Taleb把这些事件称为“黑色的天鹅”——会带来极大影响的未预期到的事件。

In one of the defining phrases of 2007, the author and investor Nassim Taleb has called these occurrences "black swans" -unexpected events that have enormous consequences.

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排程要径是否免于受到未预期的外部事件 （或特殊原因） 或冲击影响？

Was an unexpected external (or special cause) event and impact on the schedule critical path avoided?

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