残酷和不可预见的事件取代了过去，并建立了过去的桥梁。
Brutal and unforeseen events take overhand and build a bridge to the past.
最后，我们认识到存在“不能确认的”风险—该事件的发生不可预见。
Finally, we have recognized that there will be 'unidentified' risks - events which occur which were not foreseen.
为了应付不可预见事件和由此产生的成本，通常在项目成本估算中要安排一定数量的储备金。
These allowances are included in project cost estimates to accommodate unforeseen events and the resulting costs.
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