当然,这句话的英文原文是:
Key steps for improving bacterial SERS signals in complex samples: Separation, recognition, detection, and analysis.
它已经是原文,如果你需要更详细的原文上下文、出处或扩展内容,请补充说明。如果你想要相关综述或论文中的详细原文描述,可以参考如下扩展表达(假设是出自某综述文章):
The key steps for improving bacterial SERS signals in complex samples include separation of ...
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