Why the shipment arrived two weeks late remains a mystery to our logistics team.

貨物為何晚了兩週才到，對我們物流團隊來說仍是個謎。

It's a mystery how the budget figures changed after the finance meeting last Friday.

上週五財務會議後預算數字怎麼會變，實在是個謎。

The sudden drop in customer complaints is a pleasant mystery, but we should find the cause.

客訴突然減少是個令人開心的謎，但我們還是該找出原因。