Surface digitization and 3D CAD modeling are two key techniques in reverse engineering.
表面数字化和三维CAD建模是逆向工程中的关键技术。
Synchronization and channel estimation are two key techniques for OFDM systems to ensure its good performance.
为保证其具有好的性能，需要时频同步、信道估计等一系列的关键技术加以支持。
Pulse compression technique includes two key techniques: the pulse compression signal generation and processing.
脉冲压缩技术包括脉压信号的产生和处理两个关键的技术。
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