作文题目：
I want to invent_______(“我想发明__________”)
Use the following points as a reference: (以下内容仅供参考)
1. It can be used to….
2. It is helpful/ necessary to…
参考范文：
I want to invent a spaceship
Travelling in universe has always been a dream of us human being. So I want to invent a spaceship which can take us far away from our mother planet into the endless space.It can be used to save people as well. We may face very severe environmental problems in the foreseeable future. So people may get away with these life-saving spaceships and live in a whole new planet. This kind of spaceship will mark a new era in human history.
参考译文：
在宇宙旅行一直是美国人的梦想。所以我想发明一个宇宙飞船带我们远离我们的母亲地球到无穷无尽的空间。它可以用来救人。我们可能会面临很严重的环境问题在可预见的未来。所以人们会因为这些救生飞船和生活在一个全新的星球。这种飞船将在人类历史上标志着一个新时代。