语气相当肯定
示例
A：If I give her red rose, she will understand me?
B：Definitely!
A：如果我送红玫瑰，她就明白我的意思了？
B：当然啦！
A：Are you sure Laura will come?
B：Yes, definitely.
A：你确定劳拉会来吗？
B：是的，她肯定来。