7 What are there in life?

There are seven colors in the rainbow, and people have seven tricks? There are seven wonders in the world. There are puzzles in the jigsaw puzzle, and there are seven days in a week.

1, 7 o'clock

Refers to the seven orifices of the head (eyes, nose, tongue, mouth and ears). The essence of the five zang-organs reaches seven orifices respectively, and the five zang-organs are sick, which is often reflected from the changes of the seven orifices.

2. Rainbow

When the sun shines on the water droplets in mid-air, the light is refracted and reflected, forming an arched colorful spectrum in the sky, which is red, orange, yellow, green, blue, indigo and purple in turn from the outer ring to the inner ring. Seven colors. In fact, rainbows have countless colors. For example, there are many subtle differences between red and orange, but for simplicity, only seven colors are used as the differences.

3, a week

There are seven days in a week and four weeks in a month. China called it Seven Obsidian in ancient times. During the Xia, Shang and Zhou Dynasties in China, Seven Obsidian refers to seven main stars, such as the sun, the moon and the five major planets, which is an important part of astronomical astrology at that time, but it does not mean the time period. Later, one week was borrowed as a unit of seven days, so it was called a week.

4. Seven Wonders

Egyptian pyramids, Babylonian "Hanging Gardens", Turkish goddess themis, the moon goddess, the bronze statue of the sun god in Rhode Island in the Mediterranean, the Alexander Lighthouse, the statue of Zeus in the Greek Olympic Games, and the mausoleum of King Mo Solas in Turkey. However, due to earthquakes, man-made destruction and other reasons, except the pyramids, all seven wonders have been destroyed.

5, jigsaw puzzle

It consists of seven boards. These seven boards can be combined into many figures (1600), such as triangles, parallelograms, irregular polygons, etc. Players can also combine them into various characters, images, animals, bridges, houses, towers, etc., or some Chinese and English letters. Tangram was invented by the working people in ancient China, and its history can be traced back to at least the first century BC, and it was basically finalized in the Ming Dynasty.

life

1. A scientific study in the United States pointed out that sleeping 7 hours a day is the most suitable sleep time for the human body.

According to the definition of chemists, a pH of 7 means that the solution is "neutral", that is, neither acid nor alkali. The pH value of pure water is 7, while the pH value of people's daily water is very close to 7.

1899, the word "seven-year itch" was recorded for the first time. The American film The Seven-Year Itch starring Marilyn Monroe, from 65438 to 0955, tells the story of a couple's emotional crisis after seven years of marriage. Since then, the word "seven-year itch" has been widely used, and now it is almost synonymous with marriage.

Since the publication of 1989, the book Seven Habits of Efficient People has been translated into 38 languages and sold more than 5 million copies. The seven habits mentioned in the book have inspired countless people.

In Britain, bank account holders must be at least 7 years old to withdraw money from banks.

6. In addition, the sum of the points on opposite sides of the dice is 7. The tallest hotel in the world is a 7-star hotel, which is a "sailing hotel" located in Dubai, the second largest city in the United Arab Emirates.