船舶运营吨天千米费用 ship's expenses per operation ton-day-kilometer
他们不需要压缩电站和成千上万吨油。升级之后，设备维护费用降低了4倍。
They do not need compressor stations and dozens of tons of oil. After upgrading the cost of equipment maintenance has decreased 4 times.
他们得出的结论是如果计划得到实施，那么吸收1吨二氧化碳的费用为40美元---这一数字听起来便宜得有些让人尴尬，而作为初步价格，Kruger博士并不准备对外宣扬。
They concluded that if put to use they might lock up carbon dioxide for $40 a tonne—which seems almost embarrassingly cheap, and which, as a preliminary figure, Mr Kruger is keen not to hype.
欧盟规定，只有每年碳排放量低于1万吨的航空公司，才可以免收这笔费用。
The European Commission's carbon tax plan will only exempt airplanes that have an annual carbon emission of less than 10 thousand tons.
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