Those who did well on the memory test had an increase in levels of immunoglobulin A, an antibody that's the body's first line of defense against germs.
那些在记忆测试中表现良好的人,其体内的免疫球蛋白 A 水平会升高。免疫球蛋白 A 是一种抗体,是人体抵御细菌的第一道防线。
2
Capitalize all proper nouns but not the articles (a, an) that precede them.
把所有的专有名词大写,它们之前的冠词(a, an)则不用。
《柯林斯英汉双解大词典》
3
A: An information type describes a category of topics, such as concepts, tasks, or reference.