21岁对于每一个人来说都是重要的，而对于我来说也是一样，是具有里程碑意义的一年。
'Turning 21 is a significant occasion for everyone, and it's proved to be quite a milestone...
他们在空军尝试开发世界上消耗量最大的JP-8航空燃料的替代品方面，具有重要的里程碑式的意义。
They were a major milestone in the air force's attempts to develop an alternative to JP-8 aviation fuel, of which it is the largest consumer in the world.
它是世情小说乃至整个中国古代小说史上一部具有里程碑意义的重要作品，无论是在思想还是在艺术上都具有独特的成就。
It is an important work with milestone significance in the history of social trends and even in the whole novel history of ancient China, with a unique achievement both in thought and art.
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