极轴的摆放及追踪过程必须十分准确。
The alignment of the polar axis and the monitoring of the guiding process require absolute accuracy.
描述了它的体系结构和组成、追踪过程和算法。
The architecture and composition of the system are described, as well as the tracing process and algorithms.
这个术语描述了参与追踪过程的单元，即人们在输血中可能被一个可传染的病毒感染。
It is the term given to describe the processes involved in tracing units that may have been infected with a virus transmissible through blood, which were transfused to recipients.
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