The basic microscope consists of an electron source and an assembly of magnetic lenses arranged in a vertical column that is evacuated to about 10 torr or better.是什么意思_The basic microscope consists of an electron source and an assembly of magnetic lenses arranged in a vertical column that is evacuated to about 10 torr or better.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句