认知能力下降是指丧失学习新技能或回忆单词、名字和面孔的能力，这是随着年龄的增长而最常见的现象。
Cognitive decline is the loss of ability to learn new skills, or recall words, names, and faces that is most common as we age.
它包括四个步骤：看到一个单词，回忆这个词的意思，将它与句子中其他单词联系起来，再看下一个单词。这个过程同时调动了大脑的很多部分进行工作。
It includes four steps: seeing a word, getting back its meaning from your memory, connecting it to other words in the same sentence, and then moving on to the next word. This process uses many parts of the brain at one time.
研究者们在晚上教给志愿者新的单词，然后立刻检验他们对这些词汇的回忆。
Researchers taught volunteers new words in the evening and then immediately tested their recall of the words.
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