同时性取决于你从那个参考系来观察，不是吗？
Simultaneity depends on the system from which you observe it, right?
这种图示方法既强调了海退性质也强调了同时性。
This method of portrayal emphasizes both the regressive nature and the time equivalence.
同时，采用时间对准算法实现不同航迹数据的同时性。
Meanwhile, simultaneity of different flight path data can be realized via time calibration arithmetic.
服务是图书馆的主要使命，图书馆服务具有无形性、同时性和双重性。
Service is the main mission of the library with the intangible, simultaneous and dual nature.
服务是图书馆的主要使命，图书馆服务具有无形性、同时性和双重性。
Service is the main mission of the library with the intangible, simultaneous and dual nature.
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