"从不让他们得逞"是中文，意思是"永远不让他们成功"或"总是让他们失败"。这句话来源于中文语言和文化，并不是英文表达方式。
如果你想用英文来表达这个意思，可以使用以下几种表达方式:
Never let them succeed.
Always make them fail.
Never give them a chance to succeed.
例句:
I never let them succeed. 我从不让他们得逞。
I always make them fail. 我总是让他们失败。
I never give them a chance to succeed. 我从不给他们成功的机会。