After a microfiber study of the Seine River in 2014, Bruno Tassin, an urban hydrologist at University of Paris - Est, faced the same dilemma: tons of pollution without definitive point source. (scientificamerican.com)
It was also said that Christian ethics is rooted in the Bible, but not equally in all parts of it, the New Testament being our more definitive point of reference. (religion-online.org)
As Cameron got into his stride his pace slowed down, he gave firm palms - down gestures to make definitive points and gave focussed eye contact as he aimed to convince each person who asked a question. (politics.co.uk)