The safety and efficacy of a vaccine are the most important criteria in its development.
疫苗的安全性和有效性是其研发中最重要的标准。
The book, total expansion of the letter.
如果你想成长，就必须愿意承担风险。
我总是渴望学习和进步。
Behavioral economics bridges the gap between psychology and economics, offering insights into human behavior.
我是你录X战警的原因，看，我就是X，伙计。