Researchers home or abroad have made many achievements in one of its branches-failure prediction technology based on time series.

基于时间序列的故障预测技术是其中的一个重要方向，国内外学者在这方面也取得了不少研究成果。

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Many scholars and researchers have realized the problem and have made many achievements in putting forward new alternative approaches.

许多学者和研究者都已意识到这一问题，并为解决这一问题做出了诸多贡献。

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So far they have not only made some achievements, but also faced many problems.

迄今为止，它们既取得了一些成绩，也面临许多问题。

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