Launching the product without proper testing proved to be a fatal mistake for the startup.

在沒有充分測試的情況下推出產品，對這家新創公司來說是致命的錯誤。

The missing customs form caused a fatal delay that cost us the entire shipment contract.

遺漏的報關表格造成了致命的延誤，讓我們失去了整筆出貨合約。

Ignoring customer complaints for months dealt a fatal blow to the hotel's reputation.

連續數月忽視顧客投訴，對這家飯店的聲譽造成了致命打擊。