读百篇美文，做学习的主人。大家好，欢迎来到黛西英文，今天起我们将开启一个百日挑战，每日更新一篇英文短文，学习后在群里进行口语打卡，群里的小助手将每日记录学习人员，督促你的学习。
Day07 - Why are things in space round?
Most things in space, such as moons and planets, are round. That’s mostly because of gravity. planet’s gravity pulls all its matter to its center. To find a balance, the planet becomes round. It’s like water runnning down a sink. The water moves in a circular way.
1. space: n. 太空
2. round: adj.圆形的
3. most：adj.大多数的
4. such as: 比如
5. planet：n.行星
6. mostly：adv.主要地
7. because of：因为
8. gravity: n.重力
9. pull：v.拉 push :v.推
10. center: n.中心
11. balance:n.平衡
12. become：v.变得
13. sink: n.水槽
14. move：v.运动
15. circular: adj.圆形的
