请指出下列句子运用了什么说明方法。

①它们的热度非常高，表面温度至少有三千摄氏度。            ____

②许多红色的星星很大很大，有的可以装得下八十万万个太阳。____

作文：

       同学们，回首你的初中生活，一定会有一些值得怀念的往事、难以忘却的身影、记忆犹新的画面，如同闪亮的星子（星星）将你记忆的夜空点缀得璀璨而美丽。那星子，或许是父母的关爱，师长的教诲，同伴的友情；或许是拼搏的汗水，成功的欢悦，自信的笑颜；或许是懊悔的泪光，成长的烦恼，青春的思索……那星子虽然已经在夜空滑过，但它所闪耀的光辉却会永远与你相伴。请摘取其中最明亮的，来铭记你的初中时代吧！

       题目：如星子滑过夜空

       要求：①写一篇不少于600字的文章；②内容具体，有真情实感；③文体不限（诗歌、戏剧除外）；④文中请回避与你相关的人名、校名、地名等。

    Frank Brown doesn't have a soccer ball, but his brother Alan does. They go to the same school and they love soccer. They play it at school with their friends. They think it's relaxing.

    Gina Smith has two soccer balls, three volleyballs, four basketballs and five baseballs and bats. She loves sports, but she doesn't play them—she only watches them on TV!

    Wang Wei doesn't have a soccer. He thinks soccer is difficult. He likes ping-pong. It's not difficult for him. He has three ping-pong balls and two ping-pong bats. After class, he plays ping-pong with his classmates.