Paragraph taken from The Key to Learning Pronunciation, written by Fluent Forever. It discusses about a method to improve the ability of listening for language learners: learning with feedback. The limit of this method is 80% accuracy.
What if we had this tool in every language? What if we could start out by taking a few audio tests with feedback and leave with pre-trained, 80% accuracy ears, even before we began to learn the rest of our language?
If the ears are trained from 50% accuracy to 80% accuracy, why is it called pre-trained? And since we use those ears to learn the rest of the language, why does the author use leave?