试题题干
Translate the following sentence into Chinese.
But nearly all the galaxies were born at the same time, when the universe was constituted 15 billion (light) years ago.
参考答案
试题解析
考点：nearly 几乎；galaxy 星系；at the same time同时；be constituted 形成。
句子结构：句子主干为galaxies were born at the same time，when引导时间状语从句。