These include high-pressure processing, pulsed electric fields, radio-frequency electric fields, ultraviolet light, and irradiation.
这些技术包括高压处理,脉动电场,射频电场,紫外线和辐射处理。
2
As the doohickey hummed away at a very highfrequency-a whopping 6 billion cycles per second-the "piezoelectric" material in it produced a warbling electric field that was easy to detect.