At the same time, we must make the most of scientific advances over the last half-century, which have made vaccines for other preventable diseases the most powerful and cost-effective health-care investment that currently exists. Vaccines are inexpensive and easy to deliver, and they protect children for a lifetime.
与此同时，我们必须利用过去半个世纪的最大的科学进步，这些进步让其他可预防疾病的疫苗成为最有力、最廉价的卫生投资。疫苗是廉价而便于运送的，而且可以为儿童提供终生保护。疫苗已经消灭了天花，大大地降低了与麻疹、白喉和破伤风有关的儿童死亡和疾病。