In the past decades since the start-up of the Intelsat system, technology developments have led to considerable changes in the world-wide satellite transmission system.
在国际卫星系统起步后的二十余年里，技术的进展使全世界卫星传输系统发生了重大的变化。
The synaptic interface structure and the changes of its indexes of rats after cerebral infarction were analyzed with transmission electron microscopy and computer image processing system.
应用透射电镜射像及图像分析技术观察电刺激对脑梗后突触形态及其结构参数的变化。
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