当北京科兴生物制品有限公司总经理尹卫东在1992年建立公司研制一种甲型肝炎疫苗的时候，从事疫苗研发的他甚至连“生物技术”这个术语都未曾听说过。

When Yin Weidong, general manager of the vaccine developer Sinovac Biotech, established his company to develop a hepatitis A vaccine in 1992, he hadn't even heard the term 'biotech'.

youdao

凡以前没有感染过或没有接种疫苗者，均可能感染甲型肝炎。在卫生条件差的地方生活的人被感染的风险较大。

Anyone who has not had been infected previously or been vaccinated can contract hepatitis A. People who live in places with poor sanitation are at higher risk.

youdao

目的大面积接种甲型肝炎（甲肝）疫苗，建立群体免疫屏障，控制甲肝周期性流行效果评价。

Objective To build the colony immune defence and to control the periodic epidemics of hepatitis A after a mass vaccination of live attenuated hepatitis A vaccine.

youdao