undoubtedly

The invention of the printing press was undoubtedly one of the most significant events in the history of human knowledge.

(Chinese) 印刷术的发明无疑是人类知识史上最重要的事件之一。

If we don't fix the leak now, it will undoubtedly lead to much more expensive repairs in the future.

(Chinese) 如果我们现在不修补漏水处，将来无疑会导致更昂贵的维修费用。