As a precautionary measure, all employees must change their email passwords by Friday.

作為預防措施，所有員工必須在週五前更改電子郵件密碼。

The shipment was delayed for precautionary inspections after heavy storms hit the port.

暴風雨襲擊港口後，這批貨物因預防性檢查而延誤。

The airline issued a precautionary warning advising travelers to arrive three hours early.

航空公司發布預防性警告，建議旅客提早三小時抵達。