太空护栏计划是一个多阶段的采购项目，交付3个全球定位S波段雷达系统，能够完成空间监测网互操作。
The Space Fence program is a multi-phase acquisition leading to the delivery of up to three globally positioned S-band radars capable of interoperation with the Space Surveillance Network.
厌氧污泥颗粒化过程是一个多阶段过程，取决于操作条件、基质组成等多种因素。
Anaerobic sludge granulation process is a multistage process that is decided by many factors such as operational condition, substrate and so on.
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