But they are not taking care of the earth very well. They are putting too much carbon dioxide into the atmosphere, which prevents heat from escaping from the earth into space.
但是它们对地球却不怎么在意，它们把太多的二氧化碳释放到大气层中，这就阻碍了热量从地球上散发到太空中去。
They are always looking out for number one and taking care of number one. It is as if they are the one and only person on Earth.
他们总是先为自己着想，只关心自己的利益，就好像他们是地球上唯一的人。
Backpackers define themselves by traveling free of travel agencies, taking care of themselves all the way. With bags on back, they probe every corner of the earth at the lowest cost.
背包旅游者这样自我界定：不靠旅行社，一路上自己照顾自己，背着包，以最低的花费游览全世界。
Backpackers define themselves by traveling free of travel agencies, taking care of themselves all the way. With bags on back, they probe every corner of the earth at the lowest cost.
背包旅游者这样自我界定：不靠旅行社，一路上自己照顾自己，背着包，以最低的花费游览全世界。
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