一年中乘坐所有这些航班的任何人可能都会积累到总计超过35吨的碳足迹。
Anyone taking all these flights over a year might rack up a carbon footprint totaling more than 35 tonnes.
在任何一年中，大约有十几颗已知的彗星在其轨道中接近太阳。当然，一般人看不到所有的彗星。
In any given year, about a dozen known comets come close to the sun in their orbits, the average person can't see them all, of course.
一年中乘坐所有这些航班的任何人都会积累到总计超过35吨的碳足迹。
Anyone taking all these flights over a year might rack up a carbon footprint totalling more than 35 tonnes.
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