老实说，当我开始为我的书《粉色大脑，蓝色大脑》做研究时，我对这个主题并没有固定的想法。

Honestly, I had no fixed ideas on the topic when I started researching it for my book, Pink Brain, Blue Brain.

youdao

老实说，我对你的失败不感到意外。

Quite frankly , I'm not surprised you failed.

《牛津词典》

老实说，我认为你父亲批评你批评得对。

To tell you the truth, I think your father was right to criticize you.

youdao