However, I believe that mistakes are a necessary and a very natural part of life and the learning process. (wordwave.pub)
At first the girls seem nervous but we're always careful to explain that these aren't rude words and just natural parts of the anatomy. (educationbusinessuk.net)
For starters, the letters of the alphabet are abstract and the sounds they represent are not natural parts of how we speak. (gse.harvard.edu)