New Words：

universe ['ju:nivə:s] n. 宇宙；万物；世界

Sample Sentences：

The spaceship traveled smoothly in the universe.
May our friendship last till the end of the universe!
At that time people believed the earth was the center of the universe.
Why should I listen to you? Do you really think you are the center of the universe?

center ['sentə] n. 中心；中央；核心；圆心

New Words：

galaxy ['gæləksi] n. 星系；银河；银河系

Sample Sentences：

The earth is one of the planets in the Galaxy.
How can a spaceship travel across the Galaxy in no time at all?
We still don't know how many galaxies there are in the universe.

universe ['ju:nivə:s] n. 宇宙

New Words：

claim [kleɪm] v.声称；宣称；主张；要求

Sample Sentences：

They claim that they have nothing to hide.
He claims he was not given a fair hearing.
She claimed that the ring was stolen, not lost.
Does it claim that you'll lose a lot of weight in a very short time?

New Words：

exist [ig'zist] v. 存在；生存

Sample Sentences：

Man cannot exist without air.
He walked past me as if I didn't exist.
The problem only exists in your head, Jane.
Few of these monkeys still exist in the wild.

New Words：

planet ['plænit] n. 行星；地球（尤指环境）
what planet is sb. on? 指某人的想法完全不切实际

Sample Sentences：

The planets move around the sun.
Does life exist on other planets?
They claimed to have discovered a new planet.
Mars is the fourth planet in order from the sun.
He thinks being a father is easy. What planet is he on?

exist [ig'zist] v. 存在；生存
claim [kleɪm] v.声称；宣称