"I really cannot give you an answer in terms of a definitive date by which we are going to be done,"

VOA: standard.2009.09.15

If you have this so-called base case, can we actually get to a definitive answer eventually?

如果有了这个所谓的基本条件，那我们最终,能得到一个明确的答案吗？

哈佛公开课 - 计算机科学课程节选

Thus,he says,it is not possible to ascertain who is responsible for the shelling or to make a definitive casualty count.

VOA: standard.2009.05.11