I sincerely believe that this is the right decision.

　　我由衷地認為這個決定是正確的。

　　'I sincerely hope we shall meet again', he said

　　“我真心希望我們能再次重逢，”他說。

　　Maybe he sincerely wanted to help his country

　　或許他是誠心誠意地想幫助自己的祖國。

　　He sincerely believed he was acting in both women's best interests.

　　他真的認為他的所作所為對兩個女人都非常有利。

　　Are we starting that again? I most sincerely hope not.

　　我們又要舊事重提了嗎？我真的希望不要。