I. Interpretation
1, reciprocal (dào shù): If the product of two numbers is 1, one of them is called reciprocal of the other. For example, the reciprocal of 2 is 1/2, and the reciprocal of 1/5 is 5.
2. Countdown (shǔ): reverse ordinal number (shǔ), counting from back to front (shǔ): last (last)).
Second, the antonym interpretation
1, ordinal number: counting in sequence, often used for counting and sorting in daily life and work. In a competition or examination, the scores of contestants or candidates are arranged in a prescribed order for a fair comparison and evaluation. Ordinal numbers can be used to count and record data, helping people to organize and process information better.
2. Order: orderly but not disorderly. An order that conforms to the laws of nature. It conforms to laws, regulations and traditions and is conducive to social harmony and order. It means safe and smooth. In daily life and work, it is necessary to operate or handle affairs in order. Keeping order can ensure the efficiency and quality of work and avoid confusion and misunderstanding.
3. Positive number: A positive number refers to a number greater than zero. In mathematics, positive numbers are used to describe values greater than zero, including integers, decimals and fractions. In the representation of positive numbers, the number is usually preceded by a plus sign (+), such as 2, 3.5, etc.
4. Natural number: non-negative integer, that is, the number represented by the numbers 0, 1, 2, 3, 4 ... In mathematics, natural number refers to the number used to measure things or indicate the order of things. Numbers represented by the numbers 0, 1, 2, 3, 4 ... are called natural numbers.
5. Increment number: it is a special series. From the second item, each item is not less than the previous one. This means that with the increase of the number of projects, the value of the series is gradually increasing. This series is widely used in mathematics, statistics, economics and other fields, revealing a certain growth or increasing trend.
Countdown example
1. His English is very poor, and he is always at the bottom of the class.
His math performance is not ideal, and he often comes at the bottom of the class.
Although his grades are not good, he has been trying to improve, hoping to get rid of the bottom ranking.
She is the last in the class, which makes her feel very depressed.
He has always been at the bottom of the performance in the competition, but he never gives up and continues to train hard.
Although his grades are not good, he has been trying to improve, hoping to get rid of the bottom position.
7. His grades are always at the bottom of the class, but he never loses heart and insists on studying hard.
Although his grades are not ideal, he has been working hard to improve, hoping to get rid of the bottom position.
His grades have always been at the bottom of the class, but he is not discouraged and studies hard every day.
10, his performance in the competition has been counting down, but he didn't give up and continued to train hard.