但朋友不在多而在精，我珍惜新朋友，也不忘老朋友。
I cherish my new friends while keeping in touch with the old ones.
例如，可以在初始阶段进行所有的需求收集工作，而在精化阶段进行设计工作。
For example, you could do all requirement-gathering in the Inception phase and make the Elaboration phase the phase in which you do your design work.
所提出的惯性导航过程是可回溯的，因而在精对准后可以重新计算当前位置，以得到更精确的当前位置。
The proposed inertial navigation course is traceable, so that the current position can be calculated again after the precision alignment to get more accurate position.
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