忘记迭代——我见到的大部分项目将RUP用作胶棒，很少超出定义阶段并使用用例来描述前端和后端的交互。
Forget iterations — most projects I've seen used RUP as a sticker, very rarely going beyond defining the phases and using use cases to describe front - and back-end interactions.
目前的一些鲁棒性环境补偿方法具体可分为两大类：前端处理方法和后端（声学模型）处理方法。
We can categorize many state-of-the-art environment compensation approaches into two classes: the front-end and the back-end (acoustic model) processing approaches.
噪声鲁棒性的方法多种多样，但一般来说可分为前端方法和后端方法两大类。
The noise-robust methods are various and be roughly classified into two categories: front-end methods and back-end ones.
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