No system is impenetrable, and none can promise to eliminate the worst case completely.
没有哪个系统是不可攻破的,也没有哪个系统能够保证完全杜绝最坏的情况发生。
2
In February, the school system promised teachers and staff two months of retirement payments in case schools closed early, a deal that will cost the district $275,000 more.