It weighted only 180 grams and required very little storage space, making it perfect for anyone wishing to travel light.
它只有180克，几乎不占用储存空间，非常适合想轻装旅行的人。
But scientists at the University of Delaware are experimenting with little worms to better understand how space travel affects astronauts.
但特拉华大学的科学家们在用小蠕虫做实验，以更好地理解太空旅行是如何影响宇航员的。
But some people think that space travel has made little difference on people's life today.
但一些人认为太空旅行对人们今天的生活几乎没有影响。
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