1. The unexpected storm necessitated the cancellation of the outdoor event.
突如其来的暴风雨导致了户外活动的取消。

2. The company's rapid growth necessitated the hiring of more employees.
公司的快速增长使得必须招聘更多的员工。

3. The lack of funds necessitated a change in our original plans.
资金不足使得我们不得不改变最初的计划。

4. The new regulations necessitated stricter security measures at the airport.
新规定需要在机场实施更严格的安全措施。

5. The urgent situation necessitated immediate action.
紧急情况需要立即行动。

6. The damage to the building necessitated extensive repairs.
建筑物的损坏需要进行大规模的修复。