The extension of astronomy from visible light to radio waves to x-rays and gamma rays never failed to lead to the discovery of unusual objects such as radio galaxies, quasars, and pulsars.
从可见光扩展到无线电波，再到 X 射线和伽马射线，天文学总是会发现不寻常的物体，如射电星系、类星体和脉冲星。
Many farmers were among the victims killed by the tsunami waves, also extension workers and experts working for agricultural institutions.
在死于海啸浪潮的人当中有许多是农民，还有在农业机构工作的推广人员和专家。
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