They grew the virus in monkey cell cultures, they purified the virus because you got to get all the other stuff from the cells that you're growing it in a way, they inactivated it by treating it with formalin which is just a formula-- it's just a mixture of Formaldehyde; Formaldehyde cross links proteins.

研究人员将病毒种植在猴细胞内,进行培养,并提纯病毒,在某种程度上,通过这种方法,可以得到所有类型的病毒,研究人员用福尔马林,处理病毒,使其灭活,福尔马林就是甲醛的水溶液,甲醛可以使蛋白质发生交联反应

耶鲁公开课 - 生物医学工程探索课程节选

Of course, Social Security is social insurance rather than a personal retirement account, and so it uses a formula to cross-subsidize certain beneficiaries.

FORBES: The Under-30s Should Demand an Opt Out of Social Security

It would also apply to publicity on the internet and put an end to sponsorship by tobacco companies at cross-border events like Formula One motor-racing.

BBC: MEPs back tobacco promotion ban

Carwyn Jones AM said that there was cross-party consensus amongst the Welsh parties that the formula which calculates the amount of money the assembly receives from the UK parliament needed changing.

BBC: Statement on the referendum