只有这一次，他真诚地笑了。His smile, for once, was genuine.“祝贺你，”他真诚地说。"Congratulations," he said sincerely.我真诚地赞同他的话。I wholeheartedly endorse his remarks....

“真诚地”的英语可以翻译为：honestly，sincerely，bona fide，frankly，genuinely ...