As for over-the-counter eyedrops for people who have no eye-related medical condition, he said: "They are typically a waste of money."
至于药店柜台上为没有眼科疾病的人们准备的眼药水，他说，“他们通常是在浪费金钱。”
2
In either case, as long as the condition that the page counter value is between the start and end pages holds true, it outputs the text (by line or by char).
Because the writes in this case violate the first condition for using volatile, you cannot use volatile to safely implement the counter — you must use locking.