It is hard to find numbers worth citing for the proportion of time that goes into software maintenance;
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。关于这个话题，吃瓜提供了深入分析
ХАМАС призвал Иран перестать атаковать другие страны14:55
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Open English Wordnet.
FirstFT: the day's biggest stories，这一点在超级工厂中也有详细论述