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。)
It is also required an extension to your visa.(你的签证也需要延期。)
Our host ran a long extension cord out from the house and set up a screen and a projector.(我们的主人从那所房子里牵出了一条长的延长导线，安置了一块屏幕和一个投影仪。)
They've built an extension on.(他们进行了一项扩建。)
The extension of the subway will take several months.(扩建地铁需用几个月时间。)
She's on extension 2401.(她的分机号是2401。)
He will appeal to the state for an extension of unemployment benefits.(他将呼吁国家延长失业救济。)
Even less fortunate was the extension of this type of thinking to include animals as well as plants.(更不幸的是，这种思考方式从植物群体扩展到了动物群体。)
In 2006, the state went a step further, requiring that any extension of the plant's license be subject to Vermont legislature's approval.(2006年,政府更进一步要求所有工厂许可证的延期都必须经过佛蒙特州立法机构的批准。)
The blame lies with the teachers and, by extension, with the Education Service.(应受指责的是教师，再则就是教育机构。)
