to be sure困难

To be sure, the future is not all rosy.

诚然，未来并非一片光明。

To be sure, he performs an impressive variety of interesting compositions, but it is not necessary for me to visit Avery Fisher Hall, or anywhere else, to hear interesting orchestral music.

诚然，他演奏的有趣作品种类之多令人印象深刻，但我并不需要去艾弗里·费希尔音乐厅或其他任何地方，才能听到有趣的管弦乐。