1, getting started:

Quote famous sayings, poems or stories, etc. Let's explain some information about Mars. For example: "You know what? Mars is one of the planets closest to the earth in the solar system. There used to be volcanoes, atmosphere and water on Mars, but now they have all disappeared. So what secrets are hidden on Mars? "

Or: "Do you know that Mars is one of the closest planets in the solar system and one of the planets that human beings want to explore most? Let us unveil the mystery of Mars. "

2. At the beginning of the definition:

Give the definition of Mars directly, and then explain the characteristics and history of Mars step by step. For example, "Mars is the fourth planet in the solar system and is famous for its red appearance. Because it is different from the earth, Mars has always been the focus of scientists' research. "

Or: "Mars is the fourth planet in the solar system. It is called' Red Planet' because of its red appearance. Let's take a look at the interesting facts about Mars. "

3. At the beginning of the comparison:

Compare Mars with other planets, highlight the characteristics and advantages of Mars, and then explain. For example, "Mars and the Earth have many similarities, but they are also very different.

The atmosphere of Mars is similar to that of the Earth, but its composition and density are different. There are mountains and canyons on the surface of Mars, but their scales and shapes are different from those of the Earth. "

4. Question type at the beginning:

Put forward questions or opinions about Mars, arouse readers' thinking and curiosity, and then further solve them. For example: "Do you know if there is life on Mars? This problem has been puzzling scientists. We can find the answer by studying Mars. "

No matter which way we start, we should pay attention to the conciseness of the language, arouse readers' interest and curiosity, and pave the way for the following exposition.