adj.无疑的，无可非议的，确实的

The evidence for his guilt is unquestionable.
他有罪的证据确凿无疑。
The importance of protecting the environment is unquestionable.
保护环境的重要性毋庸置疑。
His dedication to his work is unquestionable.
他对工作的敬业精神无可置疑。
The safety of this vaccine has been proved to be unquestionable through numerous clinical trials.
该疫苗的安全性已经通过大量临床试验得到了无可争议的确证。
Her talent as a musician is unquestionable.
她作为音乐家的才华是毫无疑问的。
The benefits of regular exercise on health are unquestionable.
规律锻炼对健康的好处是不容置喙的。
The rules of mathematics are unquestionable truths.
数学的法则乃不争的事实。
The fact that water is essential for life is unquestionable.
水对于生命来说是必不可少的这一事实是毋庸置疑的。
The queen's authority in her own country is unquestionable.
在她的国家里，女王的权威是无可质疑的。
The value of hard work and perseverance in achieving success is unquestionable.
努力工作和持之以恒对于取得成功的价值是无可辩驳的。