这是Gmail作为完整通信服务的自然演化，Jackson还特别为该功能所提供视频的高质量感到自豪。
It was a natural evolution for the complete communication service that Gmail has become, and Jackson is particularly proud of the feature's high video quality.
这些结论帮助解释了特大质量黑洞如何可以改变它所在星系的演化。
These results help explain how a supermassive black hole can alter the evolution of its host galaxy.
各种质量的恒星的演化，均以流体力学的时间尺度进行。
Evolution of stars of all masses takes place on a hydrodynamic time scale.
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