translation.en: And then you have to store them at about minus 20 degrees C -- that's about minus four Fahrenheit, I think -- with a very critically low moisture content.
translation.zh: 然后你得把它们保存 在大约零下20度 -- 也就是零下4华氏温度，我想 -- 还要在一个非常准确的低湿度条件下。