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AC voltage regulators are used to closely control and regulate the AC voltage level being delivered to a load connected to the output of the ACThis has been traditionally done by various low frequency (LF), typically at 50 or 60Hz, electrical mains magnetic structures. These structures are typically tapped at specific discrete transformer voltage taps in various transformers or transformer configurations. Nonetheless, all these structures rely on traditional AC switching devices such as relays or semiconductor devices such as silicon-controlled rectifiers (SCR)’s or gate turn off thyristor (GTO)’s connected as anti-parallel AC switches, TRIAC’s, AC switches such as insulated-gate bipolar transistors (IGBT)’s, MOSFET transistors, and SCR’s configured as AC switches, e.g. connected between rectifiers. These AC switches are selected and activated by the electronic control circuit to automatically switch the selected magnetic transformer structure tap, in turn adjusting the transformer or transformer configuration turns ratio to control the AC output voltage as close as possible to the desired level.
各位大神，请不吝赐教主要是加粗那段话！
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你这是专业英语书上的？
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AC电压调节器用于紧密地控制和调节传送到连接到AC的输出的负载的AC电压电平
这通常由各种低频（LF）（通常为50或60Hz）电源磁结构完成。这些结构通常在各种变压器或变压器配置中的特定离散变压器电压抽头处被抽头。然而，所有这些结构依赖于传统的AC开关器件，例如继电器或半导体器件，例如作为反并联AC开关连接的可控硅整流器（SCR）或栅极断开晶闸管（GTO），TRIAC的AC开关例如被配置为AC开关的绝缘栅双极晶体管（IGBT），MOSFET晶体管和SCR，连接在整流器之间。这些AC开关由电子控制电路选择和激活以自动地切换所选择的磁性变压器结构抽头，进而调整变压器或变压器配置匝数比，以便将AC输出电压控制到尽可能接近期望水平。
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这种说明文体 直接找谷歌翻译会更加难方便
加拿大电商昨天我把提单复件发给了客户，今天收到了他回信，如下： Dear Nicholas, please send all shipping documents. We will check B/L copy and we will reply ASAP. Thank you Best Regards ......................................... 加拿大电商刚从事这行半年，对电子行业不了解，自己整理了些，算是学习，供大家分享，也请大家补充。我毕竟是个文科生，对这方面知识严重欠缺。 DVD:英文全名是Digital Video Disk, 即数字视频光
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