C : Wonderful! How much is a pair of antireflection lenses?那太好了! 一对不反光镜片约要多少钱 呢 ?I need to buy new spectacle frames but I will keep the old lenses.我需要买新的眼镜框, 不过我会留着旧镜片。These sandstone bodies form elongate lenses.这些砂岩体形成伸...
Why aren't all lenses supplied with a lens hood?为什么不给所有的镜头都配上遮光罩呢？Cataracts is a condition that affects the transparency of the lenses.白内障是一种影响晶状体透明性的疾病。Use a weatherproof rucksack to carry your camera and lenses ar...
"Actually, that isn't what happened," George corrects me.“实际上，并不是那样，”乔治纠正我。An equipment that corrects the time base errors in video tape recorders.一种校正视频磁带记录器中时基误差的设备.Wang Ping: If I say something wrong, Jeff correc...
In semiconductor receivers transistors take the place of vacuum tubes.在半导体收音机中晶体管代替了真空管.We often turn to this handbook for information on transistors.我们常从这本手册查阅有关晶体管的资料.The transformer isolates the transistors with regar...