adj.未预见到的,无法预料的;意外的,偶然的;
例句:
unforeseen delays/problems
意外的延误 / 问题
They stood aghast at this unforeseen disaster.
他们被这意外的灾祸吓呆了.
Controls should remain workable in the face of changed plans, unforeseen circumstances, or outright failures.
控制应在计划改变, 不能预见形势或显然失败时仍然可用.