The company keeps extra inventory against sudden spikes in customer demand during holidays.

公司保留額外庫存，以備假期期間顧客需求突然激增。

We bought travel insurance against possible flight cancellations on our business trip.

我們買了旅遊保險，以防出差時班機可能被取消。

Management set aside a reserve fund against unexpected repair costs next year.

管理階層撥出一筆準備金，以備明年意外的維修費用。