减少排放的路径需要多种解决方案,包括效率提升、碳捕获和替代能源。
数学不知道种族或地理界限;对于数学来说,文化世界是一个国家。
The more I see of the moneyed classes, the more I understand the guillotine.
Parents wonder why the streams are bitter, when they themselves have poisoned the fountain.