開始之前有一個保密協議答應user保密，但表達比較正式和僵硬，可以表達

開始之前有一個保密協議答應user保密，但表達比較正式和僵硬，可以表達更加隨和。

結果 (英文) 1:

Before the start, there was a confidentiality agreement that promised the user confidentiality, but the expression was more formal and rigid, and the expression could be more easy-going.

結果 (英文) 2:

Before there is a nondisclosure agreement promised to keep it confidential, but the expression is more formal and rigid, and can be expressed more easygoing.

結果 (英文) 3:

Before the beginning, there was a confidentiality agreement that allowed users to keep secret, but the expression was more formal and rigid, which could be more easygoing.