n.确实；确信
He felt a wild desire to run after them, a certitude that he could run them down. 他有股发狂的冲动去追赶它们，他确信自己能追上。
'You will like Rome,' he said, with absolute certitude. “你会喜欢罗马的。”他深信不疑地说道。
n.疑惑；不确定；无把握
